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 A6.56.56.66.66.76.76.86.87.17.17.37.37.47.47.77.77.77.77.77.7 Bank Upper BBank B4.24.25.35.35.75.76.26.26.86.87.77.77.77.78.58.59.49.410.010.0Construct a 95% confidence interval for the population standard deviation σ at Bank A. ___min<σBank A<___min Construct a 90% confidence interval for the population standard deviation σ at Bank B. ___min<σ Bank B<___min Interpret the results found in the previous parts. Do the confidence intervals suggest a difference in the variation among waiting times? Does the single-line system or the multiple-line system seem to be a better arrangement?

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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	6.56.5	6.66.6	6.76.7	6.86.8	7.17.1	7.37.3	7.47.4	7.77.7	7.77.7	7.77.7
Bank Upper BBank B	4.24.2	5.35.3	5.75.7	6.26.2	6.86.8	7.77.7	7.77.7	8.58.5	9.49.4	10.010.0

Construct a 95% confidence interval for the population standard deviation σ at Bank A.

___min<σBank A<___min

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

___min<σ Bank B<___min

Interpret the results found in the previous parts. Do the confidence intervals suggest a difference in the variation among waiting times? Does the single-line system or the multiple-line system seem to be a better arrangement?

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