# Question: A problem with a phone line that prevents a customer

A problem with a phone line that prevents a customer from receiving or making calls is upsetting to both the customer and the telecommunications company. The file Phone contains samples of 20 problems reported to two different offices of a telecommunications company and the time to clear these problems (in minutes) from the customers’ lines:

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 α = 0.05.)

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 offices.

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 α = 0.05.)

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 offices.

## Relevant Questions

Determine the critical value of x2 with 1 degree of freedom in each of the following circumstances: a. α = 0.01 b. α = 0.005 c. α = 0.10 How common is online personal data theft? A survey of internet users found that 15% of the 18 to 29 year olds, 20% of the 30 to 49 year olds, 20% of the 50 to 64 year olds, and 13% of the 65+ year olds have had important ...When performing a x2 test of independence in a contingency table with r rows and c columns, determine the upper tail critical value of the test statistic in each of the following circumstances: a. α = 0.05, r = 4 rows, c = ...What social media tools do marketers commonly use? Social Media Examiner surveyed B2B and B2C marketers who commonly use an indicated social media tool. (B2B marketers are marketers that focus primarily on attracting ...1 Fitting a straight line to a set of data yields the following prediction line: Ŷi = 2 + 5 Xi a. Interpret the meaning of the Y intercept, b0. b. Interpret the meaning of the slope, b1. c. Predict the value of Y for X = 3.Post your question