b. A random sample of 15 Bank of America customers showed a mean waiting time (in minutes) of 5.1 minutes with a standard deviation of 2.2 minutes. Another random sample of 27 Citibank customers showed a mean waiting time (in minutes) of 4.6 minutes with a standard deviation of 2.6 minutes. i. Carry out a test at a = 0.01 to find whether the mean waiting rime of Citibank customers is significantly less than the mean waiting time of Bank of America customers. Assume that population variances are equal. What is your conclusion?

b. A random sample of 15 Bank of America customers showed a mean waiting time (in minutes) of 5.1 minutes with a standard deviation of 2.2 minutes. Another random sample of 27 Citibank customers showed a mean waiting time (in minutes) of 4.6 minutes with a standard deviation of 2.6 minutes. i. Carry out a test at a = 0.01 to find whether the mean waiting rime of Citibank customers is significantly less than the mean waiting time of Bank of America customers. Assume that population variances are equal. What is your conclusion?

Calculus For The Life Sciences

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter13: Probability And Calculus

Section13.2: Expected Value And Variance Of Continuous Random Variables

Problem 10E

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