# Question

A bank branch located in a commercial district of a city has the business objective of improving the process for serving customers during the noon- to- 1: 00 p. m. lunch period. The waiting time (defined as the time the customer enters the line until he or she reaches the teller window) of a random sample of 15 customers is collected, and the results are organized and stored in Bank1. These data are:

a. At the 0.05 level of significance, is there evidence that the pop-ulation mean waiting time is less than 5 minutes?

b. What assumption about the population distribution is needed in order to conduct the t test in (a)?

c. Construct a boxplot or a normal probability plot to evaluate the assumption made in (b).

d. Do you think that the assumption needed in order to conduct the t test in (a) is valid? Explain.

e. As a customer walks into the branch office during the lunch hour, she asks the branch manager how long she can expect to wait. The branch manager replies, “ Almost certainly not longer than 5 minutes.” On the basis of the results of (a), evaluate this statement.

a. At the 0.05 level of significance, is there evidence that the pop-ulation mean waiting time is less than 5 minutes?

b. What assumption about the population distribution is needed in order to conduct the t test in (a)?

c. Construct a boxplot or a normal probability plot to evaluate the assumption made in (b).

d. Do you think that the assumption needed in order to conduct the t test in (a) is valid? Explain.

e. As a customer walks into the branch office during the lunch hour, she asks the branch manager how long she can expect to wait. The branch manager replies, “ Almost certainly not longer than 5 minutes.” On the basis of the results of (a), evaluate this statement.

## Answer to relevant Questions

A manufacturing company produces electrical insulators. If the insulators break when in use, a short circuit is likely to occur. To test the strength of the insulators, destructive testing is carried out to determine how ...An important feature of tablets is battery life, the number of hours before the battery needs to be recharged. The file Tablets contains the battery life of 12 WiFi- only and 7 3G/ 4G/ WiFi 9- through 12- inch tablets. ...Assume that you have a sample of n1 = 8, with the sample mean X1 = 42, and a sample standard deviation σ1 = 4, and you have an independent sample of n2 = 15 from another population with a sample mean of X-bar2 = 34 and a ...Let n1 = 100, X1 = 50, n2 = 100, and X2 = 30. a. At the 0.05 level of significance, is there evidence of a significant difference between the two population proportions? b. Construct a 95% confidence interval estimate for ...Determine the upper tail critical values of F in each of the following two tail tests. a. α = 0.10, n1 = 16, n2 = 21 b. α = 0.05, n1 = 16, n2 = 21 c. α = 0.01, n1 = 16, n2 = 21Post your question

0