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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

6.3

6.6

6.7

6.8

7.1

7.3

7.5

7.9

7.9

7.9

Bank Upper B

4.1

5.4

5.7

6.2

6.7

7.8

7.8

8.4

9.3

10.0

Using Chi-Square critical values, construct a 95​% confidence interval for the population standard deviation sigma at Bank A.

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