when two variables are correlated, can the researcher be sure that one variable causes the other? why or why not?

The standard error of the mean is approximately $162.08.

The standard error of the mean is a measure of the variability of the sample means. It tells us how much the sample means deviate from the true population mean. The formula for the standard error of the mean is:

SE = s / sqrt(n)

where s is the sample standard deviation, n is the sample size, and SE is the standard error of the mean.

In this case, the sample mean is $35145 and the sample standard deviation is $2393. The sample size is 217. So, we can plug these values into the formula to get:

SE = 2393 / sqrt(217)

SE ≈ 162.08

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The point at which two lines intersect is referred to as point of intersection.

In Mathematics and Geometry, a point of intersection simply refers to the location on a graph where two (2) lines intersect or cross each other, which is primarily represented as an ordered pair containing the point that corresponds to the x-coordinate (x-axis) and y-coordinate (y-axis) on a cartesian coordinate.

In order to graph the solution to a system of equations on a coordinate plane, we would use an online graphing calculator to plot the given system of equations and then take note of the point of intersection;

x² + y² = 100   ......equation 1.

3x - y = 30 ......equation 2.

Based on the graph shown, the solution to this system of equations is the point of intersection of the lines given by the ordered pairs (10, 0) and (8, -6).

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Complete Question:

What is the point at which two lines intersect?

The other Excel function commonly used for regressions is the "Regression" tool that is included in the "Data Analysis" add-in.

This tool can be used to perform a variety of regression analyses, including linear regression, multiple regression, and polynomial regression. It provides output such as the regression equation, coefficient estimates, standard errors, and goodness-of-fit measures like R-squared. To use the Regression tool, you first need to enable the Data Analysis add-in, which can be done by going to the "File" tab, selecting "Options," then "Add-ins," and finally "Excel Add-ins" in the "Manage" dropdown. From there, you can check the "Analysis ToolPak" box and click "OK" to enable the add-in. The Regression tool can then be accessed from the "Data" tab.

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The graph of the function 3x + y = 6 is added as an attachment

To graph the equation 3x + y = 6 we make use of ordered pairs,

So, we can follow these steps:

For example, you could choose x = 0, 1, 2, and 3.

When x = 0, y = -3(0) + 6 = 6, so the point (0, 6) is on the graph.

When x = 1, y = -3(1) + 6 = 3, so the point (1, 3) is on the graph.

When x = 2, y = -3(2) + 6 = 0, so the point (2, 0) is on the graph.

When x = 3, y = -3(3) + 6 = -3, so the point (3, -3) is on the graph.

Plot the ordered pairs on the coordinate plane.

Draw a straight line that passes through the points.

The resulting graph should be a straight line passing through the points (0, 6), (1, 3), (2, 0), and (3, -3).

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Oil changes is approximately 73,588.6 hours, assuming the truck is well-maintained and driven under normal conditions.

To calculate the predicted time before the first engine overhaul for the given truck, we can use the concept of engine life or engine durability, which is the expected life span of an engine before it needs to be overhauled or replaced.

The engine life of a truck depends on several factors, such as the manufacturer's specifications, maintenance practices, driving conditions, and load capacity.

Assuming that the truck is well-maintained and driven under normal conditions, we can estimate the engine life using the following steps:

Calculate the total number of hours the engine has been running per year:

Number of hours = (Miles per year) / (Average driving speed)

Number of hours = 64,000 miles / 53 mph = 1207.55 hours per year

Calculate the number of oil changes per year:

Number of oil changes per year = (Miles between oil changes) / (Miles per year)

Number of oil changes per year = 21,000 miles / 64,000 miles = 0.3281 oil changes per year

Calculate the average number of hours between oil changes:

Average hours between oil changes = (Number of hours per year) / (Number of oil changes per year)

Average hours between oil changes = 1207.55 hours / 0.3281 oil changes per year = 3679.43 hours per oil change

Estimate the engine life based on the load capacity and average hours between oil changes:

Engine life = (Load capacity in tons) * (Average hours between oil changes) / 1000

Engine life = 20 tons * 3679.43 hours per oil change / 1000 = 73,588.6 hours

Therefore, the predicted time before the first engine overhaul for the given truck driven 64,000 miles per year with an average load of 20 tons, an average driving speed of 53 mph, and 21,000 miles between oil changes is approximately 73,588.6 hours, assuming the truck is well-maintained and driven under normal conditions.

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Answer:

Euler's method is a numerical method for approximating the solution to a differential equation. It involves using the derivative of the function at a given point to estimate the function's value at a nearby point.

To use Euler's method with two steps of equal length starting at x=2, we can first compute the step size. Since we are taking two steps of equal length, the step size is h = (3-2)/2 = 0.5.

Next, we can use the following iterative formula to compute the approximate values of f(x) at each step:

f(x + h) ≈ f(x) + h * f'(x)

where f'(x) is the derivative of f(x) with respect to x, which in this case is given by:

f'(x) = x - y

Using the initial condition f(2) = 8, we can start the iteration as follows:

x1 = 2, f(x1) = 8

x2 = x1 + h = 2.5

f'(x1) = x1 - f(x1) = 2 - 8 = -6

f(x2) ≈ f(x1) + h * f'(x1) = 8 - 0.5 * 6 = 5

Now we have an approximation for f(2.5), which we can use as the initial value for the second step:

x3 = x2 + h = 3

f'(x2) = x2 - f(x2) = 2.5 - 5 = -2.5

f(x3) ≈ f(x2) + h * f'(x2) = 5 - 0.5 * 2.5 = 3.75

Therefore, using Euler's method with two steps of equal length starting at x=2, we obtain an approximation of f(3) ≈ 3.75.

Thus, the graph for the system of equations in the coordinate plane for the equation of line :  y = -x + 2 and x - 3y = -18 are plotted.

Two or more equations with the same variables are referred to be a system of equations. The intersection of the lines is the location where an equation system has a solution. Systems of equations can be solved using one of four techniques: graphing, substitution, elimination, or matrices.

The given system of equations:

y = -x + 2  ..eq 1

x - 3y = -18  ..eq 2

Solve equation 1:

y = -x + 2

Put x = 0,  y = -0 + 2 = 2 ; (0, 2)

Put y = 0,  0 = -x + 2 : x = 2 ; (2,0)

Solve equation 2:

x - 3y = -18

Put x = 0: 0 - 3y = -18 --> y = 6 (0,6)

Put y = 0, x - 3(0) = -18 --> x = (-18) ; (-18, 0)

Plot the obtained points on the  coordinate plane;

(0, 2),  (2,0) for line  y = -x + 2

(0,6),  (-18, 0) for line x - 3y = -18

Thus, the graph for the system of equations in the coordinate plane for the equation of line :  y = -x + 2 and x - 3y = -18 are plotted.

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Answer:

----------------------------

The three chords marked as equal, hence the intercepted arcs are equal too.

Let each arc measure be x, and considering full circle is 360°, find the measure of arc NP, using below equation:

Therefore mNP is 80°.

OE is perpendicular bisector of KM, therefore KE = EM and:

Hence the length of KM is 24 units

OB is the perpendicular bisector of XY and OBY is a right triangle.

Use Pythagorean theorem to find the length of BY:

XY is twice the length of BY:

Therefore the length of XY is 32 units

The answer are mNP = 80°,KM = 24 units,XY = 32 units.

Unit is a physical quantity, which is defined as the amount of physical property that is used to measure the physical property of any substance. It is an agreed-upon and accepted standard for measurement of physical property. Unit is an important element for using scientific measurements in everyday life and for scientists to measure any physical property. Unit is also used to compare different physical properties and their effects on each other. Unit helps in understanding the physical properties of any substance, which are essential for developing scientific theories and discoveries.

Question 1
The three chords marked as equal, hence the intercepted arcs are equal too.

Let each arc measure be x, and considering full circle is 360°, find the measure of arc NP, using below equation:

3x + 120 = 360
3x = 240
x = 80
Therefore mNP is 80°.

Question 2
OE is perpendicular bisector of KM, therefore KE = EM and:

KM = 2*EM = 2*12 = 24
Hence the length of KM is 24 units

Question 3
OB is the perpendicular bisector of XY and OBY is a right triangle.

Use Pythagorean theorem to find the length of BY:


XY is twice the length of BY:

XY = 2*16 = 32
Therefore the length of XY is 32 units.

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well, for the piece-wise function, we know that hmmm x = -1, -1 is less 1, so the subfunction that'd apply to that will be -2x + 1, because on that section "x is less than or equals to 1".

so f(-1) => -2(-1) + 1 => 3.

Answer:3

Step-by-step explanation:

In this case x=-1 so you will use the top equation because x<1

so f(-1) = -2(-1) + 1

          = 2+1

           =3

The pooled variance, s_p^2, is 368.6957.

To calculate s2, we first need to calculate the pooled variance using the given formula:

s_p^2 = ((n1 - 1)*s1^2 + (n2 - 1)*s2^2) / (df1 + df2)

We know the values of n1, n2, df1, df2, s1, and SS1. We can use SS1 to calculate the sample variance for the first sample, s1^2, as follows:

s1^2 = SS1 / (n1 - 1) = 291.6 / 10 = 29.16

Similarly, we can use SS2 to calculate the sample variance for the second sample, s2^2, as follows:

s2^2 = SS2 / (n2 - 1) = 12482 / 20 = 624.1

Now, substituting the values in the formula for pooled variance, we get:

s_p^2 = ((11 - 1)*29.16 + (21 - 1)*624.1) / (10 + 20) = 368.6957

Therefore, the pooled variance, s_p^2, is 368.6957.

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Testing a sample of batteries provides an efficient, cost-effective, and practical approach to assessing their lifetimes.

By employing statistical methods and a well-chosen sample, the obtained results will accurately represent the overall population without the need to test every battery.

Test a sample of batteries rather than the entire population when assessing their lifetimes.
Testing a sample of batteries is preferred because it is more efficient, cost-effective, and practical than testing the entire population.

By conducting a sample test, you can obtain accurate estimates of the batteries' lifetimes without the need to test every single battery.
Efficiency:

Testing a large number of batteries is time-consuming.

A representative sample, you can achieve similar results in a shorter period, allowing you to make decisions or take action faster.
Cost-effectiveness:

Testing all batteries would incur significant costs, including equipment, labor, and energy consumption.

A sample test, on the other hand, reduces these expenses while still providing reliable results.
Practicality:

Since the batteries will eventually be sold or used, it is impractical to test every battery in the population, as doing so would degrade their value and quality.

Sampling allows you to maintain the integrity of the remaining, untested batteries.
Statistical reliability:

With a properly selected, random sample, the results will be statistically reliable and can be extrapolated to the entire population.

The conclusions drawn from the sample test will be applicable to the whole shipment of batteries.

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The correct coefficient of determination (R-squared) for the given regression analysis is 0.6000.

The coefficient of determination (R-squared) is a measure of how much of the variation in the dependent variable (Y) is explained by the independent variable(s) (X) in a regression analysis. It is calculated as the ratio of the sum of squares of the regression (SSR) to the total sum of squares (SST), where SST is the sum of squares of the errors (SSE) and SSR.

The formula for R-squared is:

R-squared = SSR / SST

Given that SSE = 200 and SSR = 300, we can plug these values into the formula to calculate R-squared:

R-squared = 300 / (200 + 300)

R-squared = 300 / 500

R-squared = 0.6

Therefore, the correct coefficient of determination (R-squared) for the given regression analysis is 0.6000.

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Hayden ate 5/32 of the pizza.

What is a fraction?

If the numerator is bigger, it is referred to as an improper fraction and can also be expressed as a mixed number, which is a whole-number quotient with a proper-fraction remainder.

Any fraction can be expressed in decimal form by dividing it by its denominator. One or more digits may continue to repeat indefinitely or the result may come to a stop at some point.

If Hayden had 5/8 of a pizza left in the fridge, and he ate 1/4 of the leftover pizza, we can find how much of the pizza he ate by multiplying the two fractions:

(5/8) * (1/4) = 5/32

Therefore, Hayden ate 5/32 of the pizza.

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The probability that a 1 square yard section will contain less than 5 weeds is approximately 0.543 or 54.3%.

The Poisson distribution is often used to model the number of events that occur in a specific period of time or space.

To solve this problem, we can use the Poisson probability formula:

[tex]P(X < 5) = e^{-\lambda} \times \sum ^{k=0} _4 [(\lambda^k) / k!][/tex]

where P(X < 5) is the probability that the number of weeds in a 1 square yard section will be less than 5, λ is the average number of weeds per square yard (λ = 1.21 in this case), e is the mathematical constant e (approximately 2.71828), Σ is the sum symbol, k is the number of weeds in the 1 square yard section, and k! represents the factorial of k (the product of all positive integers up to and including k).

Using this formula, we can find that:

P(X < 5) = [tex]e^{(-1.21)} \times [1 + 1.21 + (1.21^2)/2 + (1.21^3)/6 + (1.21^4)/24][/tex]

P(X < 5) = 0.543 or 54.3%

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a. The value of coefficient of determination is 0.67

b. The square root of 0.67 is 0.82

c. On average, the predicted values from the regression line will be off by 8.66 units from the actual values.

a. The coefficient of determination can be found by dividing the regression sum of squares (SSR) by the total sum of squares (SST). SSR is 1,800 and SST is 2,700, therefore the coefficient of determination is 0.67.

b. Assuming a direct relationship between the variables, we can find the correlation coefficient by taking the square root of the coefficient of determination. The square root of 0.67 is approximately 0.82.

c. The standard error of estimate is a measure of how well the regression line fits the data. It can be found by taking the square root of the mean square error (MSE) from the ANOVA table. MSE is 75.00, therefore the standard error of estimate is approximately 8.66.

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The slope of the tangent to the curve r = 4-9 cos θ at the value θ = 7/2 is approximately -8.00.

To find the slope of the tangent to the curve r = 4-9 cos θ at the value θ = 7/2, we first need to find the derivative of the polar function r(θ):

r(θ) = 4-9 cos θ

Taking the derivative with respect to θ, we get:

dr/dθ = 9 sin θ

Now we can find the slope of the tangent at θ = 7/2 by plugging in the value of θ into the derivative:

m = dr/dθ (θ = 7/2)

m = 9 sin (7/2)

m ≈ -8.00

Therefore, the slope of the tangent to the curve r = 4-9 cos θ at the value θ = 7/2 is approximately -8.00.

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The solution to the given differential equation is:

y = ± ∛(3(x + ln|y| + C))

Now, We have to given the differential equation:

dy/dx = 1 + x/(xy²)

Hence, We can rewrite it as:

⇒ dy/dx = 1/y² + 1/(xy)

Now, we can separate the variables by bringing all the y terms to one side and all the x terms to the other side:

y² dy = (1 + x/y) dx

Integrating both sides, we get:

(y³)/3 = x + ln|y| + C

where C is the constant of integration.

Thus, the solution to the given differential equation is:

y = ± ∛(3(x + ln|y| + C))

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Kοdy sοlved the prοblem 2m² = and gοt answers οf 0 and. Yes he was cοrrect.

a mathematical statement that asserts the equality οf twο expressiοns is called equatiοn.

It typically cοnsists οf variables and cοnstants and mathematical οperatοrs such as additiοn, subtractiοn, divisiοn and multiplicatiοn is used tο describe relatiοnships between quantities in science and mathematics .

Equatiοns are οften written with an equal sign (=) between the twο expressiοns. It is indicating that the expressiοns οn either side οf the equal sign have the same value.

Here given Kοdy sοlved the equatiοn m² = 0 and fοund the sοlutiοns οf m = 0

Tο verify this, we can substitute each οf the sοlutiοns back intο the οriginal equatiοn and see if it satisfies the equatiοn.

When m = 0, we have m² = 0² = 0

Sο m = 0 is a valid sοlutiοn.

Therefοre, Kοdy is cοrrect that the sοlutiοns tο the equatiοn m² = 0 are m = 0 .

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Correct question is

"Kody solved the problem 2, m² = 0 and got answers of 0 and. Was he correct? Explain your reasoning."

The values of x when m=0 are -0.59 and -1.00.

To find the value of x when m=0, we need to substitute m=0 into the equation:

0 = 1.7x^2 + 2.6x + 1

Now we have a quadratic equation in standard form: ax^2 + bx + c = 0, where a=1.7, b=2.6, and c=1.

We can use the quadratic formula to solve for x:

x = (-b ± sqrt(b^2 - 4ac)) / 2a

Plugging in the values, we get:

x = (-2.6 ± sqrt(2.6^2 - 4(1.7)(1))) / 2(1.7)

Simplifying, we get:

x = (-2.6 ± sqrt(5.76)) / 3.4

x = (-2.6 ± 2.4) / 3.4

x = -0.59 or x = -1.00

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The probability that the sample mean is between 190 lbs and 205 lbs is approximately 0.9617.

The sample mean to lie within 2.83 lbs of the population mean with probability 68%, or in other words, we expect the sample mean to be between 197.17 lbs and 202.83 lbs with probability 68%.

The sample mean weight of 50 baby elephants is a normally distributed variable with a mean of 200 lbs and a standard deviation of [tex]20/\sqrt{(50)} lbs = 2.83 lbs[/tex](by the central limit theorem).

The standard normal distribution to calculate the probability that the sample mean is between 190 lbs and 205 lbs:

z1 = (190 - 200) / 2.83 = -3.53

[tex]z2 = (205 - 200) / 2.83 = 1.77[/tex]

[tex]P(-3.53 < Z < 1.77) = P(Z < 1.77) - P(Z < -3.53)[/tex]

= 0.9619 - 0.0002

= 0.9617

The interval within which we expect the sample mean to lie within probability 68%, we need to find the values of x that satisfy the following equation:

[tex]P(\mu - x < X < \mu + x) = 0.68[/tex]

X is the sample mean weight and [tex]\mu = 200[/tex] lbs.

Using the formula for the standard error of the mean, we can rewrite this equation as:

[tex]P(-x / (20 / \sqrt{(50)}) < Z < x / (20 / \sqrt{(50)})) = 0.68[/tex]

Z is a standard normal variable.

From the standard normal distribution table, we find that the 68% probability interval is from -1 to 1.

Therefore, we can solve for x as follows:

[tex]x / (20 / \sqrt{(50)}) = 1[/tex]

[tex]x = 20 / \sqrt{(50)}[/tex]

[tex]x \approx 2.83[/tex]

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The derivative of function f(x) = x sinh(x) - 7 cosh(x) is f'(x) = x cosh(x) - 6 sinh(x) - 7 cosh(x).

To find the derivative of the function f(x) = x sinh(x) - 7 cosh(x), we need to apply the product rule of differentiation. The product rule states that the derivative of the product of two functions u(x) and v(x) is given by u'(x)v(x) + u(x)v'(x). So, let's start by finding the derivatives of the two functions: f(x) = x sinh(x) - 7 cosh(x), f'(x) = (x)' sinh(x) + x(sinh(x))' - (7)'cosh(x) - 7(cosh(x))'

Using the derivatives of the hyperbolic sine and cosine functions, we get f'(x) = sinh(x) + x cosh(x) - 7 (-sinh(x)) - 7 (cosh(x)). Simplifying further, we get: f'(x) = x cosh(x) - 6 sinh(x) - 7 cosh(x)

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The exercise program in providing aid at reducing a person's weight is very effective due to the significance of 1%, under the given condition that 12-week special exercise program significantly reduces weight. 

In order to find whether there is sufficient proof to predict that the exercise program is effective at reducing a person's weight,

we need to use  a hypothesis test.

Here,

Null hypothesis H0: μd = 0

The alternative hypothesis Ha: μd < 0

Then we can consider using a one-tailed t-test containing a significance level of 1% .

Then, we are testing whether the weights after the exercise program are significantly lower than before.

Test statistic t = -3.06

p-value = 0.03.

Therefore, the p-value is lower than 0.01, we reject the null hypothesis .



The exercise program in providing aid at reducing a person's weight is very effective due to the significance of 1%, under the given condition that 12-week special exercise program significantly reduces weight. 



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The absolute maximum value of f(x) occurs at x = 9, where f(x) ≈ 4.01, and the absolute minimum value of f(x) occurs at x = 0, where f(x) ≈ 1.26.

To find the absolute maximum and minimum values of f(x) = 102 22 over the closed interval [0, 9), we need to evaluate the function at the endpoints and at any critical points in between.

First, let's evaluate f(0) and f(9):

f(0) = 102 22 = 102 ≈ 1.26

f(9) = 102 22 = 10,200 ≈ 4.01

Next, we need to find any critical points by finding where the derivative of f(x) equals zero or is undefined. However, the derivative of f(x) is always positive and never equals zero or is undefined, so there are no critical points.

Therefore, the absolute maximum value of f(x) occurs at x = 9, where f(x) ≈ 4.01, and the absolute minimum value of f(x) occurs at x = 0, where f(x) ≈ 1.26.

Note: There are no other values of x in the interval [0, 9) that need to be considered, as the function is continuous and increasing over this interval.

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The logistic model is a modification of the exponential growth model, which takes into account the limitation of environmental resources.

This means that the logistic model considers the carrying capacity of the environment, preventing unrestricted exponential growth forever.

In summary, the logistic model takes into account the limitation of environmental resources and provides a more realistic representation of population growth compared to the exponential growth model.

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a. Using Hypothesis tests, the mean fish length in the Red River population is significantly different from the population in the Coldwater River.

b. The variance in fish length in the Red River population is significantly different from the variance in the Coldwater population.

a) To conduct a hypothesis test to see if the mean fish length in the Red River population is different from the population in Coldwater River, we would use a two-sample t-test.

We would first set up the null and alternative hypotheses, calculate the test statistic, and determine the p-value.

If the p-value is less than the significance level (e.g. 0.05), we would reject the null hypothesis and conclude that the mean fish length in the Red River population is significantly different from the population in the Coldwater River.

b) To conduct a hypothesis test to see if the variance in fish length is different in the Red River population compared to the variance in the Coldwater population, we would use a two-sample F-test.

We would first set up the null and alternative hypotheses, calculate the test statistic, and determine the p-value. If the p-value is less than the significance level (e.g. 0.05), we would reject the null hypothesis and conclude that the variance in fish length in the Red River population is significantly different from the variance in the Coldwater population.

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The arc length of the curve y = √(36 − x²), 0 ≤ x ≤ 6 is approximately 18.8496.

The arc length formula can be used to find the length of any smooth curve between two points.

Now, let's apply this formula to find the arc length of the curve y = √(36 − x²), 0 ≤ x ≤ 6. First, we need to find the derivative of y with respect to x:

y' = -x / √(36 - x²)

Next, we can plug this into the arc length formula and integrate over the interval [0,6]:

L = ∫₆⁰ √[1 + (y')²] dx = ∫₆⁰ √[1 + x² / (36 - x²)] dx

This integral is quite difficult to solve analytically, so we can use numerical methods or a computer algebra system to evaluate it. The result is approximately 18.8496.

To check our answer, we can note that the curve y = √(36 − x²), 0 ≤ x ≤ 6 is actually part of a circle with radius 6. In fact, if we rearrange the equation y = √(36 − x²) to solve for x, we get:

x = √(36 - y²)

which is the equation of the upper half of a circle centered at the origin with radius 6. The arc length of this circle between x = 0 and x = 6 is simply the circumference of the circle multiplied by 1/2, since we are only looking at the upper half of the circle:

L = 1/2 * 2π(6) = 3π(6) = 18π

This is approximately 18.8496 as well, which confirms our previous calculation.

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The probability of a player weighing less than 250 pounds is approximately 0.9772.

Answer: a. 0.9772

We can use the normal distribution to find the probability of a football player weighing less than 250 pounds.

First, we need to calculate the z-score of 250, using the formula:

[tex]z = (x - μ) / σ[/tex]

where x is the weight of interest, μ is the mean weight, and σ is the standard deviation.

Plugging in the values, we get:

[tex]z = (250 - 200) / 25 = 2[/tex]

Using a standard normal distribution table or calculator, we can find the probability that a standard normal random variable is less than 2. This probability is approximately 0.9772.

Since the weight of football players is normally distributed with mean 200 pounds and standard deviation 25 pounds, we can use the standard normal distribution to find the probability of a player weighing less than 250 pounds.

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The complete table for the relative frequency for the attached table is given by,

                   7th         8th       Total

0 - 300        61%      38%       99%

300+           39%      62%       101%

Total           100%     100%      200%

From the attached table of 7th and 8th graders,

Number of social media contacts of 7th graders are,

In the range of  0- 300,

94

And 300+ ,

61

Number of social media contacts of 8th graders are,

In the range of  0- 300,

55

And 300+ ,

90

Value of the missing cells for the relative frequency ,

For 7th graders

(61 / 155 )× 100 = 39.3

                        ≈ 39%

For 8th graders

( 55/145 ) × 100 = 37.9

                          ≈38%

In the row of total cells,

7th graders,

61% + 39% = 100%

8th graders

38% + 62% = 100%

For 0 - 300

61%+ 38% = 99%

For 300+

39% +62%= 101%

Over all total

100% + 100% = 200%

99% + 101% =200%

Therefore, all the value of the  two-way relative frequency table are as follow,

                   7th         8th       Total

0 - 300        61%      38%       99%

300+           39%      62%       101%

Total           100%     100%      200%

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The above question is incomplete, the complete question is:

Question attached.

The farmer should harvest the potatoes 20 days after July 1 to maximize revenue.

This is because the price drops by 2 cents per bushel per extra day, so the longer the potatoes are left in the field, the lower the price per bushel. Therefore, the farmer should harvest when the revenue is maximized.

Using the formula R=(2-0.02x)(80+x), we can calculate the revenue for different values of x.

By taking the derivative of R with respect to x and setting it equal to 0, we can find the critical point where the revenue is maximized. Solving for x, we get x=20. Therefore, the farmer should harvest the potatoes 20 days after July 1 to maximize revenue.

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The probability that a randomly selected elementary school teacher earns more than $555 a week is approximately 0.8238 or 82.38%.

We can use the standard normal distribution to solve this problem by standardizing the value of $555 and finding its corresponding probability.

The standardized value of $555 is:

z = (x - μ) / σ = (555 - 595) / 43 = -0.93

where x is the weekly salary we're interested in, μ is the mean weekly salary, and σ is the standard deviation of weekly salaries.

We can now look up the probability of a standard normal random variable being greater than -0.93 in a standard normal distribution table, or use a calculator or statistical software. The probability is approximately 0.8238.

Therefore, the probability that a randomly selected elementary school teacher earns more than $555 a week is approximately 0.8238 or 82.38%.

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