Notando's argument for showing that the series 1 - 1/2 - 1/3 - 1/4- 1/5 - 1/6 + 1/7... is alternating
Notando's argument for showing that the series 1 - 1/2 - 1/3 - 1/4- 1/5 - 1/6 + 1/7... is alternating involves the following steps
First, he observes that the denominators of the terms in the series are all positive integers, and that they increase without bound. This means that the series does not have a finite limit, and may not converge.
Next, he considers the terms of the series in pairs, by adding together consecutive terms. Specifically, he adds the first two terms, then subtracts the third term, adds the fourth term, and so on. This gives him a new series consisting of the sums of pairs of terms
1 - (1/2 + 1/3) - (1/4 + 1/5) - (1/6 + 1/7) - ...
Notando then observes that the terms in each pair have opposite signs, and that the magnitude of the second term in each pair is strictly smaller than the magnitude of the first term. This is because the denominators of the second terms are always larger than the denominators of the first terms.
Since the terms in each pair have opposite signs and decreasing magnitudes, Notando concludes that the series consisting of the sums of pairs of terms is alternating.
Finally, Notando argues that if a series consisting of the sums of pairs of terms is alternating, then the original series is also alternating. This is because adding or subtracting a series of alternating terms preserves the alternating property.
Therefore, Notando concludes that the series 1 - 1/2 - 1/3 - 1/4- 1/5 - 1/6 + 1/7... is alternating.
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You earn $130.00 for each subscription of magazines you sell plus a salary of $90.00 per week. How many subscriptions of magazines do you need to sell in order to make at least $1000.00 each week?
Find the indefinite integral Sb a [f(x) + g(x)]dx =
The indefinite integral of f(x) + g(x) is: ∫[f(x) + g(x)] dx = ∫[tex]x^2[/tex] dx + ∫3x dx = (1/3)[tex]x^3[/tex] + (3/2)[tex]x^2[/tex]+ C where C is a constant of integration that combines the constants of integration from both integrals.
Using the linearity property of integration, we can split the integral into two parts:
∫[f(x) + g(x)] dx = ∫f(x) dx + ∫g(x) dx
Therefore, we have:
∫b a [f(x) + g(x)] dx = ∫b a f(x) dx + ∫b a g(x) dx
This means that we can find the indefinite integral of the sum of two functions by finding the indefinite integral of each function separately and adding them together.
For example, if we have f(x) = [tex]x^2[/tex] and g(x) = 3x, then we can find the indefinite integral of f(x) and g(x) separately:
∫[tex]x^2[/tex] dx = (1/3)[tex]x^3[/tex] + C₁
∫3x dx = (3/2)[tex]x^2[/tex] + C₂
where C₁ and C₂ are constants of integration.
Therefore, the indefinite integral of f(x) + g(x) is:
∫[f(x) + g(x)] dx = ∫[tex]x^2[/tex] dx + ∫3x dx = (1/3)x^3 + (3/2)[tex]x^2[/tex] + C
where C is a constant of integration that combines the constants of integration from both integrals.
In general, we can apply this method to find the indefinite integral of any sum of functions.
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We can show that, when the null hypothesis H0: rho = 0 is true and the random variables have a joint normal distribution, then the random variable which is used to test the hypothesis that there is no linear association in the population between a pair of random variables, follows the:
We can show that, when the null hypothesis H0: rho = 0 is true and the random variables have a joint normal distribution, then the random variable which is used to test the hypothesis that there is no linear association in the population between a pair of random variables, follows the t-distribution with n-2 degrees of freedom, where n is the sample size. This is known as the t-test for correlation coefficient.
This is known as the t-distribution because the distribution of the test statistic follows the t-distribution rather than the standard normal distribution, which is typically the case when testing population means or proportions. The reason for this is because the standard error of the correlation coefficient estimate depends on the sample size n and the sample correlation coefficient r. Therefore, the t-distribution is used to account for the variability due to the sample size and the sample correlation coefficient. The degrees of freedom for the t-distribution is n-2, where n is the sample size, because two parameters (the population mean and the population standard deviation) are estimated from the sample in order to compute the sample correlation coefficient.
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An enterprise is planning a new radio, TV, and newspaper advertising campaign. A radio commercial costs $300, a TV commercial costs $800, and a newspaper ad costs $150. A total maximum budget of $30,000 is allocated to the campaign; however the number of ads in each campaign cannot exceed 70% of the total number of ads. It's estimated that a radio commercial will reach 1,750 people, a TV commercial will reach 5120, and a newspaper ad is expected to reach 870 people. We wish to use integer programming to determine how we should allocate the available budget into the three advertisement types. How much of the available budget will be unused at the optimal solution? Round your answer to the nearest whole number and do not include the dollar sign "$" with your answer. For example, "$1.59" should be entered as "2".
[tex]$50[/tex] of the available budget will be unused at the optimal solution.
Let [tex]x1, x2[/tex], and [tex]x3[/tex] denote the number of radio, TV, and newspaper ads, respectively.
Then the objective function to be maximized is:
[tex]1750x1 + 5120x2 + 870x3[/tex]
subject to the constraints:
[tex]300x1 + 800x2 + 150x3 < = 30000[/tex] (budget constraint)
[tex]x1 < = 0.7(x1 + x2 + x3)[/tex]
[tex]x2 < = 0.7(x1 + x2 + x3)[/tex]
[tex]x3 < = 0.7(x1 + x2 + x3)[/tex]
[tex]x1, x2, x3 > = 0[/tex](non-negativity constraint)
An integer programming solver to solve this problem.
The optimal solution is [tex]x1 = 43, x2 = 37[/tex], and [tex]x3 = 127[/tex], with a total cost of [tex]$29,950[/tex].
The amount of the available budget that will be unused at the optimal solution is:
[tex]30,000 - 29,950 = 50[/tex]
Rounding this to the nearest whole number, the answer is 50.
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A card is drawn from a pack of 52 cards. The probability of getting a queen or a king of heart is: O 5/52 O 5/12 O 3/36 O 9/12 Two dice are tossed. The probability that the sum of each dice is a prime number is: 0 5/12 09/36 0 24/36 14/36
The probability that the sum of each dice is a prime number is 5/12
The likelihood of getting a ruler or a lord of heart from a deck of 52 cards can be calculated as takes after:
- There are 4 rulers of hearts and 4 rulers of hearts in a deck of 52 cards.
- So, the likelihood of getting a ruler of hearts or a ruler of hearts is the whole of the likelihood of getting a ruler of hearts and the likelihood of getting a ruler of hearts.
- The likelihood of getting a lord of Hearts is 4/52 since there are 4 Lords of Hearts out of 52 cards within the deck.
- Additionally, the likelihood of getting a ruler of hearts is 4/52.
- Subsequently, the likelihood of getting a lord of hearts or a ruler of hearts is 4/52 + 4/52 = 8/52, which can be disentangled to 2/13.
When two dice are hurled, there are 36 conceivable results (6 conceivable results for each pass-on). The entirety of the two dice ranges from 2 to 12. We have to discover the likelihood that the whole of the two dice could be a prime number.
The prime numbers between 2 and 12 are 2, 3, 5, 7, and 11. There are 4 ways to urge an entirety of 2 (1+1),
3 ways to urge a whole of 3 (1+2, 2+1, 3+0),
4 ways to induce a sum of 4 (1+3, 2+2, 3+1, 4+0),
5 ways to urge an entirety of 5 (1+4, 2+3, 3+2, 4+1, 5+0),
6 ways to induce a sum of 6 (1+5, 2+4, 3+3, 4+2, 5+1, 6+0),
5 ways to induce an entirety of 7 (1+6, 2+5, 3+4, 4+3, 5+2),
4 ways to induce a whole of 8 (2+6, 3+5, 4+4, 5+3),
3 ways to urge a sum of 9 (3+6, 4+5, 5+4),
2 ways to induce an entirety of 10 (4+6, 5+5),
1 way to induce a whole of 11 (5+6),
and 1 way to induce an entirety of 12 (6+6).
Subsequently, there are 15 ways to induce a whole that's a prime number (2, 3, 5, 7, or 11) out of a add up to 36 conceivable results. Consequently, the likelihood that the entirety of the two dice may be a prime number is 15/36, which can be disentangled to 5/12. Therefore, the reply is 5/12.
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a package of gift cards has a length of 8 inches, a width of 4 inches and a volume of 64 inches cubed. what is the height of the box?
The height of the box is 2 inches.
Given: A package of gift cards has a length of 8 inches, a width of 4 inches, and a volume of 64 inches cubed.
To Find: The height of the box.
Solution: We can use the volume of a rectangular prism formula to compute the height of the box.
V = l x w x h.
Where V denotes volume,
l denotes length,
w denotes width,
and h denotes height.
It is given that the volume is 64 inches cubed and the length and breadth of the box are 8 and 4 inches, respectively.
Now, the formula becomes h = Volume / (length x width)height
Here, we get,
64 / (8 x 4)h
Now, after solving the above equation with the given formula we get the height of the box = 2 inches. As a result, the box's height is 2 inches.
Thus, the height of the box is 2 inches.
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Evaluate the definite integral I = S6 3 |x-4|dxif it is defined. (If the integral in undefined, enter 'DNE' as your answer.)
The definite integral is 2.5.
The given definite integral is ∫₆³ |x-4| dx. We can evaluate this integral by breaking it up into two separate integrals, depending on the sign of x-4. When x-4 ≥ 0, the absolute value of x-4 is simply x-4, and when x-4 < 0, the absolute value of x-4 is -(x-4). Thus, we have:
We can split the integral into two parts:
For x between 3 and 4:
I1 = ∫[tex]3^4[/tex] (x-4)dx
= [[tex]x^2[/tex]/2 - 4x][tex]3^4[/tex]
= [(16-12)-(9/2-12)]
= 2.5
For x between 4 and 6:
I2 = ∫[tex]4^6[/tex] (4-x)dx
= [4x - [tex]x^2[/tex]/2][tex]4^6[/tex]
= [(24-16)-(16-8)]
= 0
So the total integral is:
I = I1 + I2 = 2.5 + 0 = 2.5
Therefore, the definite integral is 2.5.
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help asap!!!!!!!!!!!
The number of ways to complete a true-false examination consisting of 23 questions is given as follows:
2^23 = 8,388,608.
What is the Fundamental Counting Theorem?The Fundamental Counting Theorem states that if there are m ways to do one thing and n ways to do another, then there are m x n ways to do both.
This can be extended to more than two events, where the number of ways to do all the events is the product of the number of ways to do each individual event
[tex]N = n_1 \times n_2 \times \cdots \times n_n[/tex]
In the context of this problem, the parameters are given as follows:
23 questions.Each question has two outcomes, true or false.Hence the total number of outcomes is given as follows:
2^23 = 8,388,608.
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Find the derivative: g(x) = Sx 3 e^(t²-t)dt
The derivative of g(x) is g'(x) = [tex]-x e^(x²-x) + 3 e^3.[/tex]
To find the derivative of g(x) = ∫(x to 3) e^(t²-t) dt, we need to apply the fundamental theorem of calculus, which states that if a function f(x) is continuous on the closed interval [a,b] and F(x) is any antiderivative of f(x), then the definite integral of f(x) from a to b is given by F(b) - F(a).
Using this theorem, we can find g'(x) by evaluating the integral at the upper limit of integration (x=3) using the chain rule:
[tex]g'(x) = d/dx [∫(x to 3) e^(t²-t) dt][/tex]
= [tex]e^(3²-3) * d/dx[3] - e^(x²-x) * d/dx[x][/tex]
= [tex]-x e^(x²-x) + 3 e^(6-3)[/tex]
= -[tex]x e^(x²-x) + 3 e^3[/tex]
Therefore, the derivative of [tex]g(x) is g'(x) = -x e^(x²-x) + 3 e^3.[/tex]
In calculus, the derivative of a function measures how much the function changes as its input changes. It is defined as the limit of the ratio of the change in the function's output to the change in its input, as the change in the input approaches zero. Geometrically, the derivative represents the slope of the tangent line to the curve at a given point.
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I need help answering these questions
1. (0/2 points) DETAILS PREVIOUS ANSWERS SCALCET8 4.7.003 Find two positive numbers whose product is 16 and whose sum is a minimum. (If both values are the same number, enter into both blanks) 32 X (s
The two positive numbers x = 4 and y = 4 have a product of 16 and a minimum sum.
An expression in mathematics is a set of numbers, variables, and operators that can be evaluated to yield a value, including addition, subtraction, multiplication, and division. Parentheses, other symbols, and mathematical functions are also acceptable expressions.
The two positive numbers will be denoted by x and y. The problem statement states that we have:
xy = 16 …...(1)
x + y = ?
The substitution method can be used to find the values of x and y. We can determine the value of one of the variables, say y, from equation 1:
[tex]y =\dfrac{ 16}{x}[/tex]
When we enter this expression in the second equation in place of y, we obtain:
[tex]x + y = x + \dfrac{16}{x}[/tex]
Take the derivative of this equation with respect to x and set it to zero in order to minimize it:
[tex]\dfrac{d}{dx} (x + \dfrac{16}{x}) = 1 - \dfrac{16}{x^2} = 0[/tex]
Solving for x, we get:
x = 4
Substituting this value back into equation 1,
y = 4
Therefore, the two positive numbers whose product is 16 and whose sum is a minimum are x = 4 and y = 4.
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The two positive numbers whose product is 16 and whose sum is minimized are x = y = 4.
The problem is asking us to find two positive numbers whose product is 16 and whose sum is minimized.
Let x and y be the two positive numbers. Then we have:
xy = 16, or y = 16/x (by dividing both sides by x)
We want to minimize x + y = x + 16/x
To find the minimum value of x + 16/x, we can use calculus. We take the derivative of this expression with respect to x, set it equal to zero, and solve for x:
d/dx (x + 16/x) = 1 - 16/x^2 = 0
Solving for x, we get x = 4. Plugging this value of x into y = 16/x, we get y = 4 as well.
Therefore, the two positive numbers whose product is 16 and whose sum is minimized are x = y = 4.
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Find the exact value of each expression. (Enter your answer in radians.)
(a) sinâ1(â3/2)
b) cosâ1(1/2)
The expression of sine function of sinâ1(â3/2) is undefined. The value of cosâ1(1/2) = π/3 radians.
The expression sinâ1(â3/2), since the sine function is only defined for angles between -π/2 and π/2, we cannot find an angle with a sine of -â3/2. Therefore, the expression is undefined.
The expression cosâ1(1/2), Since the cosine function is positive for angles between 0 and π, we know that the angle we are looking for is in the first or fourth quadrant.
To find the angle, we can use the inverse cosine function, which gives us the angle whose cosine is equal to the given value. Therefore, we have
cosθ = 1/2
Taking the inverse cosine of both sides, we get
θ = cos⁻¹(1/2)
Using the unit circle or trigonometric identities, we can find that cos⁻¹(1/2) = π/3 or 2π/3. Since the cosine function is positive in the first quadrant and negative in the fourth quadrant, we choose the solution in the first quadrant, which is θ = π/3.
Therefore, cosâ1(1/2) = π/3 radians.
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Derek purchased a toaster durng the mall sale. The original price of the toaster was 30$. If Derek got a discount of 3$ what percent is the discount?
4.4.1-8 In a smoking survey among men between the ages of 25 and 30. 63% prefer to date nonsmokers, 1396 prefer to date smokers, and 24% dont care. Suppose nine such men are selected randomly. Let X equal the number who prefer to date nonsmokers and Y equal the number who prefer to date smokers. (a) Determine the joint pmf of X and Y. Be sure to include the support of the pmf. (b) Find the marginal pmf of X. Again include the support.
The support of the joint pmf is {(0,0), (0,1), (1,0), (1,1), (2,0), (2,1), (3,0)}.
The support of the marginal pmf of X is {0, 1, 2, 3}.
The total number of men surveyed is not given, so we cannot find the probabilities directly.
The given percentages to make an estimate. Let's assume that there are 1000 men surveyed.
Then, 63% prefer nonsmokers, which means that 630 men prefer nonsmokers, 1396 prefer smokers, and 240 don't care.
This gives us the following probabilities:
P(X = 0, Y = 0) = P(neither nonsmoker nor smoker) = P(don't care) = 0.24
P(X = 0, Y = 1) = P(smoker) = 0.1396
P(X = 1, Y = 0) = P(nonsmoker) × P(choose 1 nonsmoker from 8 men who are not smokers) = 0.63 × 8/9 ≈ 0.56
P(X = 1, Y = 1) = P(nonsmoker) × P(choose 1 smoker from 6 smokers) = 0.63 × 6/9 ≈ 0.42
P(X = 2, Y = 0) = P(nonsmoker) × P(choose 2 nonsmokers from 8 non-smokers) = 0.63 × 8/9 × 7/8 ≈ 0.35
P(X = 2, Y = 1) = P(nonsmoker) × P(choose 1 nonsmoker from 8 non-smokers) × P(choose 1 smoker from 6 smokers) = 0.63 × 8/9 × 6/8 ≈ 0.21
P(X = 3, Y = 0) = P(nonsmoker) × P(choose 3 nonsmokers from 8 non-smokers) = 0.63 × 8/9 × 7/8 × 6/7 ≈ 0.22
The support of the joint pmf is {(0,0), (0,1), (1,0), (1,1), (2,0), (2,1), (3,0)}.
To find the marginal pmf of X, we sum the joint pmf over all possible values of Y:
P(X = 0) = P(X = 0, Y = 0) + P(X = 0, Y = 1) ≈ 0.38
P(X = 1) = P(X = 1, Y = 0) + P(X = 1, Y = 1) ≈ 0.98
P(X = 2) = P(X = 2, Y = 0) + P(X = 2, Y = 1) ≈ 0.56
P(X = 3) = P(X = 3, Y = 0) ≈ 0.22
The support of the marginal pmf of X is {0, 1, 2, 3}.
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In a regression and correlation analysis if r 2 = 1, then a. SSE = SST b. SSE = 1 c. SSR = SSE d. SSR = SST
In a regression and correlation analysis if r 2 = 1 then SSR = SST
In a regression and correlation , if r² = 1, then the correct answer is d. SSR = SST.
Here's a step-by-step explanation:
1. r², known as the coefficient of determination, measures the proportion of variation in the dependent variable that can be explained by the independent variable(s) in the regression model.
2. When r² = 1, it indicates a perfect fit, meaning all the variation in the dependent variable is explained by the independent variable(s).
3. In this case, the total sum of squares (SST) is equal to the sum of squares due to regression (SSR), as there is no error or unexplained variation left.
4. Thus, SSR = SST when r² = 1.
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How do you do this? Please explain, not only send the answers.
a) [tex]\sqrt{75} =5\sqrt{3}[/tex]
b)[tex]\sqrt{(162)}=9\sqrt{2[/tex]
c)[tex]\sqrt{(48)}=4\sqrt{(3)}[/tex].
d)[tex]\sqrt{243} =9\sqrt{3} .[/tex]
e) [tex]\sqrt[4]{300}[/tex]
What is simplification?
When anything is made simpler or is broken down to its most basic components, it is referred to as being simplified. It is a simplification, as is any such diagram. Making anything simpler is the act or process of simplification.
a) [tex]\sqrt(75)=\sqrt(25*3)=\sqrt(25)*\sqrt(3)=5\sqrt(3).[/tex]
b) [tex]\sqrt(162) =\sqrt(81 * 2) = \sqrt(81) * \sqrt(2) = 9 \sqrt(2).[/tex]
c) [tex]\sqrt(48) = \sqrt(16 * 3) = \sqrt(16) * \sqrt(3) = 4 \sqrt(3).[/tex]
d) [tex]\sqrt(243) = \sqrt(81 * 3) = \sqrt(81) * \sqrt(3) = 9 \sqrt(3).[/tex]
e) [tex]\sqrt[4]{300}[/tex]
= 2 x 2 x root(3, 4) x 5
= 4 root(3, 4) x 5
= 20 root(3, 4)
f) 3√(125) = 3 x √(125)
= 3 x 5 √(5)
= 15 √(5)
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The quantity demanded each month of the Walter Serkin recording of Beethoven's Moonlight Sonata, produced by Phonola Media, is related to the price per compact disc. The equation
p
=
−
0.00047
x
+
7
(
0
≤
x
≤
12
,
000
)
where
p
denotes the unit price in dollars and
x
is the number of discs demanded, relates the demand to the price. The total monthly cost (in dollars) for pressing and packaging
x
copies of this classical recording is given by
C
(
x
)
=
600
+
2
x
−
0.00002
x
2
(
0
≤
x
≤
20
,
000
)
.
To maximize its profits, how many copies should Phonola produce each month? (Round your answer to the nearest whole number.)
To maximize its profits, Phonola should produce approximately 7,447 copies of the Moonlight Sonata recording each month.
To maximize its profits, Phonola should produce the number of copies where its revenue is maximized. First, let's find the revenue function:
Revenue (R) = Price per CD (p) × Number of CDs (x)
R(x) = px
From the given equation, p = -0.00047x + 7.
Plug this into the revenue function:
R(x) = (-0.00047x + 7)x
R(x) = -0.00047x^2 + 7x
Now, we need to find the number of CDs (x) that maximizes the revenue function. To do this, we'll take the derivative of R(x) with respect to x, and set it equal to zero:
R'(x) = dR(x)/dx = -0.00094x + 7
Set R'(x) to 0 and solve for x:
-0.00094x + 7 = 0
x = 7 / 0.00094
x ≈ 7,446.81
Round the answer to the nearest whole number:
x ≈ 7,447
So, Phonola should produce approximately 7,447 copies to maximize its profits.
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Use Newton's method to approximate a root of the equation 3sin(x)=x as follows. Let x1=1 be the initial approximation. Find second approximation x2 and third approximation x3.
The second approximation (x2) is approximately 0.92213, and the third approximation (x3) is approximately 0.93456 for the equation 3sin(x) = x using Newton's method.
To use Newton's method, start with the initial approximation x1 = 1. The equation is 3sin(x) = x, so its derivative is 3cos(x) - 1. Now, follow these steps:
1. Plug x1 into the original equation and its derivative:
f(x1) = 3sin(1) - 1 = 1.4112
f'(x1) = 3cos(1) - 1 = 0.98999
2. Calculate x2 using the formula: x2 = x1 - f(x1)/f'(x1)
x2 = 1 - 1.4112 / 0.98999 = 0.92213
3. Repeat the process for x3:
f(x2) = 3sin(0.92213) - 0.92213 = 0.06983
f'(x2) = 3cos(0.92213) - 1 = 0.74473
x3 = x2 - f(x2)/f'(x2) = 0.92213 - 0.06983 / 0.74473 = 0.93456
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when one changes the significance level of a hypothesis test from 0.10 to 0.05, which of the following will happen? check all that apply. a. the chance of committing a type i error changes from 0.10 to 0.05. b. it becomes harder to prove that the null hypothesis is true. c. the chance that the null hypothesis is true changes from 0.10 to 0.05. d. the test becomes less stringent to reject the null hypothesis (i.e. it becomes easier to reject the null hypothesis). e. it becomes easier to prove that the null hypothesis is true. f. the chance of committing a type ii error changes from 0.10 to 0.05. g. the test becomes more stringent to reject the null hypothesis (i.e., it becomes harder to reject the null hypothesis).
a. There is a 0.10 to 0.05 decrease in the likelihood of making a type I error. b. It gets more difficult to demonstrate that the null hypothesis is accurate. d. The null hypothesis can be rejected with less difficulty.
What is correlation and causation?When two variables are correlated, it means that there is a statistical relationship between them in which changes in one variable are accompanied by changes in the other. association does not necessarily indicate causality, though, as other factors may have an impact on both variables and contribute to the association. To put it another way, correlation does not show which variable changes the other variable.
Contrarily, in a link between two variables known as causation, a change in one variable immediately results in a change in the other.
The following will occur if a hypothesis test's significance threshold is changed from 0.10 to 0.05:
a. There is a 0.10 to 0.05 decrease in the likelihood of making a type I error.
b. It gets more difficult to demonstrate that the null hypothesis is accurate.
d. The null hypothesis can be rejected with less difficulty (i.e., the test becomes less demanding).
g. The test gets more demanding to reject the null hypothesis, making it more difficult to do so.
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9 TWO marbles are drawn one by one from a well-shuffled box containing 2 gold marbles, 6 silver marbles and 9 bronze balls. (correct 10 4 decimal places) ) Find the probability that they are both gold marbles if the first marble is replaced; (b) Find the probability that they are both silver marbles if the first marble is no replaced 9. (a) There are 18 girls and 18 boys in a class. To find out their most favorite subjects in the class, 5 girls and boys are selected in ratio at random for an interview.. (1) What type of sampling method is used! (1) Is it a probability sampling or non-probability sampling? (1) Can this method help to get rid of bias in sampling? (b) To conduct a survey about the opinions of people on a new smart phone just launched to the market, the first 200 people walking out of a shopping mall are interviewed. Identify the sampling method What type of sampling method is used? (1) Is it a probability sampling or non-probability sampling
Probability sampling simply illustrates a scenario where the subjects of the population have an equal opportunity
(a) The sampling method used is stratified random sampling, where the population is divided into strata (gender) and a random sample is taken from each stratum.
It is a probability sampling method.
Yes, this method can help to reduce bias in sampling by ensuring that the sample is representative of the population.
(b) The sampling method used is convenience sampling, where individuals are selected based on their availability and willingness to participate.
It is a non-probability sampling method.
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9) how many more saplings with a height of 27 1/4 inches or less were than saplings with a height greater than 27 1/4
To find the difference between the numbers of saplings with a height of 27 1/4 inches or less and those with a height greater than 27 1/4 inches, we need to calculate the values of n1 and n2.
What is height?Height is the measure of an object's distance from the ground or base to its highest point. It is measured in units of length, such as inches, feet, or centimeters. Height is an important factor that influences an individual's physical appearance, health, and lifestyle. It can also be used to compare the size of different objects or people. Height is a key factor in many sports and activities, as taller people tend to have an advantage.
To answer this question, we need to calculate the difference in the numbers of saplings with a height of 27 1/4 inches or less and those with a height greater than 27 1/4 inches. Let us call the number of saplings with a height of 27 1/4 inches or less as n1 and the number of saplings with a height greater than 27 1/4 inches as n2.
We can calculate the difference between n1 and n2 by subtracting n2 from n1. This difference, which is the number of saplings with a height of 27 1/4 inches or less that were more than saplings with a height greater than 27 1/4 inches, can be expressed as:
Difference = n1 - n2
Therefore, to find the difference between the numbers of saplings with a height of 27 1/4 inches or less and those with a height greater than 27 1/4 inches, we need to calculate the values of n1 and n2.
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Complete questions as follows-
how many more saplings with a height of 27 1/4 inches or less were than saplings with a height greater than 27 1/4 inches?
It a class of 50 students, 3/5 are girals. How many boys are there in the class?
Answer:
The answer to your problem is, 20
Step-by-step explanation:
First find 3/5 of 50 which is:
3/5 of 50 = 30
Make 3/5 to a complete fraction ( Example 4/4 )
= 5/5.
Subtraction:
5/5 - 3/5 = 2/5
Second find 2/5 of 50 which is:
2/5 of 50 = 20.
20 is the answer.
Thus the answer to your problem is, 20
Compute the length of r(t) =(√2 t, e^t, e^-t ) on the interval 0 ≤ t≤ l. (4) Given the points (-3, 3, -7), (-1, 2, -4), (5, -1,5), (1,1, -1) show that these points are collinear in five different ways (parallel vectors, the cross product, the dis- tance formula, the dot product, and the equation of a line).
If three points are collinear, then the distance between any two of them plus the distance between the other two is equal to the distance between all three.
[tex]d12 + d34 = d13 + d24 = d14 + d23 = 3√22 + √14 + 3√3 + 2√14 + 6√3 + √14 = 9[/tex]
To compute the length of r(t), we can use the formula for the Euclidean norm of a vector:
[tex]||r(t)|| = √(x(t)^2 + y(t)^2 + z(t)^2)[/tex]
Substituting the components of r(t), we get:
[tex]||r(t)|| = √(2t^2 + e^(2t) + e^(-2t))[/tex]
To find the length on the interval 0 ≤ t ≤ l, we substitute l for t and subtract the value of ||r(0)||:
[tex]length = ||r(l)|| - ||r(0)|| = √(2l^2 + e^(2l) + e^(-2l)) - √2[/tex]
For the second part of the question, we want to show that the points (-3, 3, -7), (-1, 2, -4), (5, -1, 5), and (1, 1, -1) are collinear in five different ways:
Parallel Vectors:
If three points are collinear, then the vectors between them are parallel. We can find two vectors using the first and last point, and check if the vector between the second and fourth point is parallel to them:
[tex]v1 = < 1 - (-3), 1 - 3, -1 - (-7) > = < 4, -2, 6 > v2 = < 5 - 1, -1 - 1, 5 - (-1) > = < 4, -2, 6 >[/tex]
The vectors are parallel, so the points are collinear.
Cross Product:
If three points are collinear, then the cross product of the vectors between them is zero. We can find two vectors using the first and last point, and calculate the cross product with the vector between the second and fourth point:
[tex]v1 = < 1 - (-3), 1 - 3, -1 - (-7) > = < 4, -2, 6 > v2 = < 5 - 1, -1 - 1, 5 - (-1) > = < 4, -2, 6 > v1 x (v4 - v2) = < 4, -2, 6 > x < -4, 3, 3 > = < 0, 0, 0 >[/tex]
The cross product is zero, so the points are collinear.
Distance Formula:
If three points are collinear, then the distance between any two of them plus the distance between the other two is equal to the distance between all three. We can calculate the distances between the pairs of points and check if they satisfy this equation:
[tex]d12 = √[(2)^2 + (1)^2 + (3)^2] = √14d13 = √[(-4)^2 + (-2)^2 + (-6)^2] = 6√3d14 = √[(2)^2 + (2)^2 + (6)^2] = 2√14d23 = √[(6)^2 + (3)^2 + (9)^2] = 3√22d24 = √[(6)^2 + (3)^2 + (9)^2] = 3√22d34 = √[(4)^2 + (3)^2 + (4)^2] = 3√3d12 + d34 = d13 + d24 = d14 + d23 = 3√22 + √14 + 3√3 + 2√14 + 6√3 + √14 = 9[/tex]
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What is the removable discontinuity of the function
h(x)=x-2/x power of 2 -4
Answer:
x = 2
Step-by-step explanation:
You can expand the denominator to:
(x-2) / (x-2)(x+2)
Then the (x-2) would cancel out, so you are left with:
1 / (x+2)
x = 2 was the removable discontinuity since we were able to cancel it out
Hope this helps!
∫(1 to [infinity]) xe^-x2 dx is
A -1/e
B 1/2e
C 1/e
D 2/e
E divergent
The integral ˆ«(1 to [infinity]) xe^-x2 dx, is E) divergent, that is, an indefinite integral with an upper limit of infinity.
How do we evaluate the indefinite integral?Let's use the following steps to evaluate indefinite integral:
ˆ«(1 to [infinity]) xe^-x2 dx
We can start by making a substitution to simplify the integral.
We substitute u = -x^2, du = -2x dx. When x approaches infinity, u approaches negative infinity, and when x is 1, u is -1.
Now we can rewrite the integral with the substitution:
ˆ«(-1 to -infinity) e^(u/2) du
Next, we can use the limit property of integrals to evaluate the integral as u approaches negative infinity:
lim[u->-infinity] ˆ«(-1 to u) e^(u/2) du
As u approaches negative infinity, e^(u/2) approaches zero, so the integral becomes zero or the integral converges to zero.
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What is the range for this set of data?
Answer:
7
Step-by-step explanation:
1) Given the function f(x)=x-lnx-x? Find a) f'(x)=? b) f'(e)=?
(a) Using the power rule and the product rule, we can find that:
f'(x) = -1/x
(b) To find f'(e), we substitute e for x in the derivative we found in part a:
f'(e) = -1/e
The derivative of the given function f(x) = x - ln(x) - x, and then evaluate it at x = e.
a) To find f'(x), we'll take the derivative of each term in the function with respect to x:
f(x) = x - ln(x) - x
The derivative of x with respect to x is 1, and the derivative of -x is -1. To find the derivative of -ln(x), we use the chain rule. The derivative of ln(x) with respect to x is 1/x, so the derivative of -ln(x) is -1/x.
Combining these derivatives, we get:
f'(x) = 1 - 1/x - 1
b) Now, we'll find the value of f'(x) when x = e:
f'(e) = 1 - 1/e - 1
Simplifying the expression, we get:
f'(e) = 1 - (1 + e)/e
So, the answers are:
a) f'(x) = 1 - 1/x - 1
b) f'(e) = 1 - (1 + e)/e
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John invests $2000 in a bond fund that pays 4. 75% compounded quarterly
John's investment will thus be worth $2098.56 after a year. A = 2000 * 1.0120264 A = 2000 * 1.04928125 A = 2098.56
what is expression ?
It is possible to multiply, divide, add, or subtract in mathematics. The following is how an expression is put together: Number, expression, and mathematical operator The components of a mathematical expression (such as addition, subtraction, multiplication or division, etc.) include numbers, variables, and functions. It is possible to contrast expressions and phrases. An expression, often known as an algebraic expression, is any mathematical statement that contains variables, numbers, and an arithmetic operation between them. For instance, the word m in the given equation is separated from the terms 4m and 5 by the arithmetic symbol +, as does the variable m in the expression 4m + 5.
After a set amount of time, we can apply the compound interest calculation to determine the future worth of John's investment:
[tex]A = P * (r/n + 1)^{n*t}[/tex]
In this instance, John invests $2,000 in a bond fund paying 4.75% quarterly compounded. This implies:
(Annual interest rate) r = 0.0475
(Compounded quarterly) n = 4
We can set t = 1 to determine the future worth of John's investment after a year:
A = [tex]2000 * (1 + 0.0475/4)^{4*1}[/tex]
A =[tex]2000 * 1.01202643^4[/tex] A = 2000 * 1.04928125 A = 2098.56
John's investment will thus be worth $2098.56 after a year.
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Complete question : John invests $2000 in a bond fund that pays 4. 75% compounded quarterly. What will be his investment after a year?
Determine whether the given geometric series is convergent or divergent, and find the sum if it is convergent. 5) 5) 1' ਦੇ ' ਚ ' ਭੇਤ ' 5)15 + 1 + 49 343
The sum of this convergent geometric series is 225/14.The given series is a geometric series with first term a = 15 and common ratio r = 1/7. To determine whether the series is convergent or divergent, we use the formula for the sum of a geometric series:
S = a/(1-r)
Substituting a = 15 and r = 1/7, we get:
S = 15/(1-1/7) = 15/(6/7) = 17.5
Since the sum S is a finite number, the geometric series is convergent. Therefore, the sum of the given series is 17.5.
Hello! Let's first identify the given geometric series and the relevant terms. From your input, it appears that the series is:
15 + 1 + 49/343
To determine if a geometric series is convergent or divergent, we need to identify the common ratio (r). We can find this by dividing the second term by the first term, and then checking if the ratio is consistent throughout the series.
(1/15) = (49/343) / 1
The common ratio (r) is 1/15.
Now, let's see if this series is convergent or divergent. A geometric series is convergent if the absolute value of the common ratio (|r|) is less than 1, and divergent otherwise.
In our case, |r| = |1/15| = 1/15, which is less than 1. Therefore, this geometric series is convergent.
To find the sum of this convergent geometric series, we can use the formula:
Sum = a / (1 - r)
where a is the first term and r is the common ratio.
Sum = 15 / (1 - 1/15)
Now, let's calculate the sum:
Sum = 15 / (14/15)
Sum = (15 * 15) / 14
Sum = 225 / 14
So, the sum of this convergent geometric series is 225/14.
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What is the probability of picking a 5 and then picking a 4? Simplify your answer and write it as a fraction or whole number.
The value of the probability of picking a 5 and then picking a 4 is 1/3
Determining the probability of picking a 5 and then picking a 4?From the question, we have the following parameters that can be used in our computation:
Rolling a fair, six-sided number cube
The sample space of a number cube is
S = {1, 2, 3, 4, 5, 6}
Where the outcome is 4, we have
P(4) = 1/6
Where the outcome is 5, we have
P(5) = 1/6
Using the above as a guide, we have the following:
P(4 or 5) = P(4) + P(5)
So, we have
P(4 or 5) = 1/6 + 1/6
Evaluate
P(4 or 5) = 1/3
Hence, the value of P(4 or 5) is 1/3
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Suppose a 95% confidence interval for μ turns out to be (1000, 1900). Give a definition of what it means to be "95% confident" in an inference.
To be "95% confident" in an inference means that there is a 95% probability that the true value of the population parameter (in this case, the mean denoted by μ) falls within the calculated confidence interval, which is (1000, 1900).
A confidence interval is a range of values that is calculated from a sample of data and is used to estimate an unknown population parameter, such as the mean. The confidence level, expressed as a percentage (in this case, 95%), indicates the level of confidence we have in the interval capturing the true population parameter.
In this context, the confidence interval (1000, 1900) means that we are 95% confident that the true population mean (μ) falls within this range. This does not mean that there is a 95% probability that the true population mean falls within the specific interval (1000, 1900), as the true population mean is a fixed value and not subject to probability. Instead, it means that if we were to repeat the sampling process and construct 100 different confidence intervals, about 95 of those intervals would contain the true population mean.
Therefore, being "95% confident" in an inference means that there is a high degree of confidence that the true population parameter falls within the calculated confidence interval, based on the sample data and the chosen level of confidence.
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