12 Jan 10.9 A problem with a telephone line that prevents
10.9 A problem with a telephone line that prevents a customer from receiving or making calls is upsetting to both the customer and the telephone company. The file contains samples of 20 problems reported to two different offices of a telephone company and the time to clear these problems (in minutes) from the customers’ lines: Central Office I Time to Clear Problems (minutes) Central Office II Time to Clear Problems (minutes) a. Assuming that the population variances from both offices are equal, is there evidence of a difference in the mean waiting time between the two offices? (Use ) b. Find the p-value in (a) and interpret its meaning. c. What other assumption is necessary in (a)? d. Assuming that the population variances from both offices are equal, construct and interpret a 95% confidence interval estimate of the difference between the population means in the two office
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