Answer:
The population can be divided into strata so that the individuals in each stratum are as much alike as possible.
Step-by-step explanation:
In short, if you can group the population into subgroups and are interested in their sub properties, then use stratified random sampling. If not, and interested only in the entire population as a whole, then use simple random sampling.
Simple random sampling, as the name suggests, is simply sampling randomly from the population. It doesn't make any assumptions of sub-classifications about the given population and is only interested in sampling the population as a whole representative.
Stratified random sampling, as the name suggests, does sampling on strata( parts or subgroups divided in the population). The sampling then is done from each group proportionate to the group's size versus the population size.
One example is when you've got red, green and blue colored balls as the population and you want to sample the population based on colors, then the colored groups are strata and thus, the sampling will be done on subgroups and such type of sampling will be called as stratified random sampling.
Simple random sampling doesn't care about sub-properties in the population. It consider the population as whole and doesn't differentiate classes in the population, unlike stratified random sampling.
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Grandma brought two dozen cookies to Thanksgiving dinner. All but 3 were eaten that night. How many cookies were eaten
Answer:
21
Step-by-step explanation:
2 dozen=24
24-3=21
it is a type of interest where the interest is computed based on the principal value only
Write the equation of the line in fully simplified slope-intercept form.
Answer:
you can write the equation of any line in the form of y = mx + b .
Step-by-step explanation:
Answer:
[tex]y = - \frac{1}{6} x + 2[/tex]
Step-by-step explanation:
Slope-intercept form
y= mx +c, where m is the slope and c is the y-intercept.
Let's first identify the coordinates of two points on the graph:
(-6, 3) and (6, 1)
[tex]\boxed{slope = \frac{y1 - y2}{x1 - x2} }[/tex]
Slope
[tex] = \frac{3 - 1}{ - 6 - 6} [/tex]
[tex] = \frac{2}{ - 12} [/tex]
[tex] = - \frac{1}{6} [/tex]
Substitute the value of the slope into m in the equation:
[tex]y = - \frac{1}{6} x + c[/tex]
To find the value of c, substitute a pair of coordinates into the equation.
When x= 6, y= 1,
[tex]1 = - \frac{1}{ 6} (6) + c[/tex]
1= -1 +c
c= 1 +1
c= 2
Thus, the equation of the line is y= -⅙x +2.
The y-intercept can also be derived from the graph as we can see that the line passes through the y- axis at (0, 2). This point can also be used to find the slope of the line too.
If y varies directly with x and y=12 when x=3, find y when x=1.
Answer:
y = 4
Step-by-step explanation:
y ∝ x
y = kx (k is constant)
when y = 12 and x = 3
y = kx
=> 12 = k*3
∴ k = 4
when x = 1 and k = 4
y = kx
= 4*1
= 4
Today, the price of a new cellphone is $380. In 2010,
the price of a similar cellphone was $240. What is the
percent of change in the price of a cellphone from 2010
to today? Round your answer to the nearest hundredths
place.
The percent of change in the price of a cellphone from 2010
to today is 58.33%
The price of cellphone was $240 in 2010.
While the price of cellphone presently is $380.
The percent of change in the price of a cellphone from 2010 to today is:
Percent change in price = [(380 - 240)/240] * 100%
Percent change in price = 58.33%
Hence, The percent of change in the price of a cellphone from 2010
to today is 58.33%
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there here 3 Green marbles in and 15 Bule marbles bag. what is the ratio of green marbles to the total number of marbles
4 miles, 0.375 inches. as a fraction
Answer:
4 3/8 i think
Step-by-step explanation:
What do I do with the “y = -f(x) +6” given to find the Domain and Range?
Answer:
Step-by-step explanation:
a.Changing f with -f does not change its domain, it just flips the image across the x axis. Adding 6 to the result, just shifts everything towards the positive y by 6 units. Domains stays the same, from -4 to +8. Range instead goes up, the lowest value is -2+6 = 4 and the highest value is 2+6 = 8.
So domain remains the same [-4; 8] and range goes to [4;8]
a. This time we're shifting everything on the horizontal axis, one unit to the left (the way to remember it is that f(x) has a minimum at x=4, while after the shift the new value happens at x=3) multiplying the value by 3 means that every value gets scaled up. It means the minimum becomes -2*3= -6 and the maximum happens at 2*3= 6. The shift brings the domain to [-5;7] and the range to [-6,6]
find the value of X in the triangle shown below
Step-by-step explanation:
61 degree
We have 2 sides equal so we know that we have 2 angles equal180 _ 58 =122
122 is the sum of the two angles
If we divide 122 by 2 we'll get 61
Answer:
61°
Step-by-step explanation:
hope this helps! :D
Please Help
Question is on the picture
1. An average person blinks 50 times every 2.5
minutes. How many blinks occur in 10 minutes
Answer:
200 blinks because if you 2.5 times 4 it equals 10
CAN SOMEONE HELP ME PLEASE ASAP!
Write this equation in slope intercept form.
What is the slope and y-intercept?
3y + 3x = 15
Answer: the slope is -1, and the y-intercept is 5.
Step-by-step explanation:
To find the slope and y-intercept, we change the equation to y = mx + b form, where m is the slope and b is the y-intercept.
3y + 3x = 15 (Minus 3x to both side)
3y = -3x + 15 (Divide 3 from the both side, to get in term of y)
y = - x + 5
Using y = mx + b form, in this case, the slope is -1, and the y-intercept is 5.
A rectangular table is measured to be 264 centimetres long and 1.55 metres wide.Convert the length of the rectangular table to metres. Write your answer as a decimal.
Answer:
2.64m
Step-by-step explanation:
A rectangular table is measured to be 264 centimetres long and 1.55 metres wide.Convert the length of the rectangular table to metres. Write your answer as a decimal.
100cm = 1m
so
264cm = 2.64m
Which rule explains why these triangles are similar?
A. SSS
B. SAS
C. AA
D. None of the above; the triangles cannot be proven similar
Answer:
refer to the picture for step by step answer
hope it helps
HELPPPPPPPPPPPPPP PLZZZZZZZZZZZZZZZZZZZZ QUICKLYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
Find f ◦ g, g ◦ f, and g ◦ g.
f(x) = x + 2, g(x) = x - 5
Answer:
fg(x)=f(g(x)
=f(x-5)
But ;f(x)=x+2
f(x-5)=(x-5)+2
=x-5+2
fg =x-3
gf(x)=g(f(x))
=g(x+2)
But ;
g(x)=x-5
g(x+2)=(x+2)-5
=x+2-5
=x-3
g(g)=g(x-5)
g(x-5)=(x-5)-5
=x-5-5
=x-1
please help me with this
What is the area of the sector shown in the diagram below?
The number of cups of dog food a dog eats varies directly with the number of cups of eater it drinks. In a certain period, the dog eats 16 cups of dog food and drinks 6 cups of water. How many cups of dog food will a dog eat if it drank 15 cups of water?
I really need help
Answer:
40 cups of foodStep-by-step explanation:
Equation of direct variation:
y = kx, where k is the coefficient of variationWe have:
16 = 6kFind the value of k:
k = 16/6 = 8/3Now the equation is:
y = 8/3xWe have x = 15, find the value of y:
y = 8/3*15 = 8*5 = 40Help ASAP thank you
Answer:
The expression is one line to the right of -5.
Step-by-step explanation:
Answer:
your answer is -2 1/3
Step-by-step explanation:
Your not smart how old are you btw but I don't know why you need help on first grade math!!!!!!!!!!!
But anyways here you go. and please leave a heart and give me a 5star rating
A Web music store offers two versions of a popular song. The size of the standard version is 2.9 megabytes (MB). The size of the high-quality version is 4.6 MB. Yesterday, the high-quality version was downloaded three times as often as the standard version. The total size downloaded for the two versions was 4342 MB. How many downloads of the standard version were there?
Answer:
260 Downloads
Step-by-step explanation:
s = number of standard downloads
3s = number of high-quality downloads
2.9s + 4.6(3s) = 4342
2.9s + 13.8s = 4342
16.7s = 4342
s = 260
The standard version was downloaded 260 times and the high-quality version was downloaded 780 times.
What is the distance between (-5, -5) and (−9,−2)
Answer:
hope u understand
refer the picture
Answer:
5
Step-by-step explanation:
Distance formula: (see attached file) pythogorean rule
is the squared coordinates x added to squared coordinates of y
X- coordinates: -5 & -9
Y- coordinates: -5 & -2
Substitute into equation:
[tex]distance = \sqrt{ ( - 5- - 9)^{2} + ( - 5 - - 2)^{2} } = 5[/tex]
Evaluate the expression when x=7 and y=-2 9x-y
Answer:
65
Step-by-step explanation:
9x - y
9*7 - (-2)
63 + 2
65
Three friends attended a game together.
The cost of one ticket was $50.
The cost of parking, p, was shared equally.
Write an expression to represent the dollar amount it cost each friend to attend the game?
Answer:
50+p/3
Step-by-step explanation:
Each friend has a 50 flat fee = 50
Parking is divided between 3 people so each person pays 1/3 of the parking fee
if p = price of parking 50 + p/3
6
Find the indicated z score the graph depicts the standard normal distribution with mean 0 and standard deviation 1
Answer:
The indicated z-score is 1.77
Step-by-step explanation:
procedure finding the z-value is listed below:
1.From the table of the standard normal distribution, locate the probability value as 0.9616.
2.Move left until the first column is reached. Note as 1.7.
3.Move upward until the top row is reached. Note as 0.07.
4.Locate the probability value, by the intersection of the row and column values, gives the area to the left of z = 1.77
SEE THE FORMULA BELOW.
955 divided by 8 hbgvgvgkkbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Answer:
119.38
Step-by-step explanation:
955÷8=119.375
=119.38
I need help plzz
I need someone to explain if these are congruent or not
(algebra 1) please helppp i’ll mark brainliest to whoever gets it right
Answer:
a. Breakfast is 10 & Lunch is 15
Step-by-step explanation:
25 = 50%
x = 30%
y = 20%
1% = 0.5 because 25/50= 0.5
0.5 x 30 = 15 and 0.5 x 20 = 10
What type of angle is 45 degrees???
Answer:
Acute angle
Step-by-step explanation:
45°= Acute Angle
‘Cause It's less than 90°
Answer:
Step-by-step explanation:
It's an acute angle. Acute, in this case, means anything between 0 and 90 written 0<x<90. Notice that you are using < and not ≤. The endpoints are not included. They have their own names. 90 is a right angle. 0 is called a zero degree angle.
