By assuming the standard deviation of population 2.2 the confidence interval is 8.67 toys,8.94 toys.
Given sample size of 1492 children,99% confidence interval , sample mean of 8.8, population standard deviation=2.2.
This type of problems can be solved through z test and in z test we have to first find the z score and then p value from normal distribution table.
First we have to find the value of α which can be calculated as under:
α=(1-0.99)/2=0.005
p=1-0.005=0.995
corresponding z value will be 2.575 for p=0.995 .
Margin of error=z*x/d
where x is mean and d is standard deviation.
M=2.575*2.2/
=0.14
So the lower value will be x-M
=8.8-0.14
=8.66
=8.67 ( after rounding)
The upper value will be x+M
=8.8+0.14
=8.94
Hence the confidence interval will be 8.67 toys and 8.94 toys.
Learn more about z test at brainly.com/question/14453510
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Ok so the answer to this was a bit tricky but it is 1,8
Answer:
ANSWER IS 1,050
Step-by-step explanation:
You take 1,500 and multiply it by 70%
Hope this helps
So let's begin!
So the length is 25 and the entire perimeter is 106. Lets put these both of these numbers as information we know.
We know the length is 25.
We know the full perimeter is 106.
We also know a rectangle has 2 pairs of congruent sides.
Okay so, the length is 25.
Since there are two sides that are the same we would multiply 25 by 2 to get 50.
Now we know 2 sides out of the four sides on a rectangle.
106 is the final perimeter, if we subtract 50 from 106, we get 56. That is the measurement for both sides we're missing but we need to know the width for just one side.
So we divide 56 by 2 to get 28.
The width is 28.
Heres the show your work part:
25 x 2 = 50
Gets both lengths for rectangle.
106 - 50 = 56
Gets the product for the widths.
56 / 2 = 28
Gets the width of just one side.
Your final answer: 28
