The waiting times​ (in minutes) of a random sample of 2020 people at a bank have a sample standard deviation of 3.33.3 minutes. Construct a confidence interval for the population variance sigma squaredσ2 and the population standard deviation sigmaσ. Use a 90 %90% level of confidence. Assume the sample is from a normally distributed population.       Question content area bottom Part 1 What is the confidence interval for the population variance sigma squaredσ2​?   ​(enter your response here​,enter your response here​) ​(Round to one decimal place as​ needed.) Part 2 Interpret the results. Select the correct choice below and fill in the answer​ box(es) to complete your choice. ​(Round to one decimal place as​ needed.)     A. With 90 %90% ​confidence, you can say that the population variance is lessless than enter your response here.   B. With 90 %90% ​confidence, you can say that the population variance is between enter your response here and enter your response here.   C. With 1010​% ​confidence, you can say that the population variance is greatergreater than enter your response here.   D. With 1010​% ​confidence, you can say that the population variance is between enter your response here and enter your response here. Part 3 What is the confidence interval for the population standard deviation sigmaσ​?

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The waiting times​ (in minutes) of a random sample of
2020
people at a bank have a sample standard deviation of
3.33.3
minutes. Construct a confidence interval for the population variance
sigma squaredσ2
and the population standard deviation
sigmaσ.
Use a
90 %90%
level of confidence. Assume the sample is from a normally distributed population.
 
 
 

Question content area bottom

Part 1
What is the confidence interval for the population variance
sigma squaredσ2​?
 
​(enter your response here​,enter your response here​)
​(Round to one decimal place as​ needed.)
Part 2
Interpret the results. Select the correct choice below and fill in the answer​ box(es) to complete your choice.
​(Round to one decimal place as​ needed.)
 
 
A.
With
90 %90%
​confidence, you can say that the population variance is
lessless
than
enter your response here.
 
B.
With
90 %90%
​confidence, you can say that the population variance is between
enter your response here
and
enter your response here.
 
C.
With
1010​%
​confidence, you can say that the population variance is
greatergreater
than
enter your response here.
 
D.
With
1010​%
​confidence, you can say that the population variance is between
enter your response here
and
enter your response here.
Part 3
What is the confidence interval for the population standard deviation
sigmaσ​?
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