The values listed below are waiting times? (in minutes) of customers at two different banks. At...

The values listed below are waiting times? (in minutes) of customers at two different banks. At Bank? A, customers enter a single waiting line that feeds three teller windows. At Bank? B, customers may enter any one of three different lines that have formed at three teller windows. Answer the following questions. Bank A 6.36.3 6.66.6 6.76.7 6.86.8 7.17.1 7.37.3 7.47.4 7.87.8 7.87.8 7.87.8 Bank Upper BBank B 4.24.2 5.45.4 5.85.8 6.26.2 6.76.7 7.77.7 7.77.7 8.68.6 9.39.3 10.010.0 Construct aa 90% confidence interval for the population standard deviation sigma? at Bank A. Construct aa 90?% confidence interval for the population standard deviation sigma? at Bank B.

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Expert Solution

At Bank A,

sample variance

and sample size n = 10

a 90% confidence interval for the population variance is

a 90% confidence interval for the population standard deviation is

At Bank B,

sample variance

and sample size n = 10

a 90% confidence interval for the population variance is

a 90% confidence interval for the population standard deviation is

orchestra answered 1 year ago

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