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 6.5 6.6 6.7 6.8 7.1 7.2 7.4 7.8 7.8 7.8   Bank B 4.1 5.3 5.9 6.2 6.7 7.6 7.6 8.6 9.2 10.0                                                                                                                                                                                         A.  Construct  a 90​%confidence interval for the population standard deviation σ at Bank A                                                                                                                                                                     _____min

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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
6.5
6.6
6.7
6.8
7.1
7.2
7.4
7.8
7.8
7.8
 
Bank B
4.1
5.3
5.9
6.2
6.7
7.6
7.6
8.6
9.2
10.0
                                                                                                                                                                                        A.  Construct  a 90​%confidence interval for the population standard deviation
σ at Bank A                                                                                                                                                                     _____min  <o Bank A < ______min                                                                                                                                                                                                                                                                                                                       B.  Construct a 90% confidence interval for the population standard deviation  σ at Bank B.
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