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...

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
7.2
7.4
7.9
7.9
7.9


Bank B
4.3
5.4
5.8
6.2
6.7
7.6
7.6
8.5
9.2
10.0

Click the icon to view the table of​ Chi-Square critical values.

Construct a 90​% confidence interval for the population standard deviation sigma at Bank A.

(answer) min less than sigma Subscript Bank A less than (answer) min

Construct a 90​% confidence interval for the population standard deviation sigma at Bank B.

(answer) min less than sigma Subscript Bank A less than (answer) min