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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

6.4

6.6

6.7

6.8

7.1

7.3

7.6

7.9

7.9

7.9

Bank Upper BBank B

4.3

5.4

5.8

6.2

6.7

7.7

7.7

8.4

9.4

10.0

Construct a 99​% confidence interval for the population standard deviation

sigma at Bank A.

_min < σ Bank A < _min

Construct a 99​% confidence interval for the population standard deviation

sigma at Bank B.

_min < σ Bank B < _min

Math   Statistics-And-Probability   
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