Evidence of a difference in the mean waiting time

Assignment Help Basic Statistics

Reference no: EM13102568

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 Excel file Phone (posted) 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.

a) Assuming 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) What is the p-value?

c) Assuming that the population variances from both offices are equal, construct a 95% confidence interval estimate of the difference between the population means in the two offices.

Reference no: EM13102568

Questions Cloud

Why is it significant to secure windows and unix servers : CIO has asked you to describe why you suggest it is so significant to secure your Windows and Unix/Linux servers from known shortcomings/vulnerabilities.

Evaluation using a chi-square test for goodness of fit : The data show that 48 of the doctors picked Brand X. If these data are evaluated using a chi-square test for goodness of fit, what is the expected frequency for Brand X?

Determining probability-random variables : Let the random variable X denote the number of emergency calls received by the campus police office each day. The probability mass function of X is given by:

How formal organizations have evolved over past century : Describe how formal organizations have evolved over past century. Write down differences were there in organizations a century ago, compared to today's organizations?

Evidence of a difference in the mean waiting time : Assuming 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

What is the research design and its variables : A sample of patients for one busy primary care practice is used as the comparison group. What is the research design and its variables?

Experiment for binomial and poisson : Suppose you are on a test and are asked to determine whether the given experiment is binomial, Poisson, or neither. What are you going to think about to determine which test to use. Do you have a checklist? How would you approach this problem?

Make bibliography on moral-ethical issues by henry woodward : Prepare the bibliography on moral and ethical issues brought about invention of light bulbs by Henry Woodward and Mathew Evans in Toronto during the 1870s.

Surival rate for caucasians for all forms : The five year surival rate for Caucasians for all forms increased from 37% in 1960 to 58% now. Express this change in two ways (1) as an absolute difference in terms of percentage points and (2) as a relative difference in terms of percent.

User Account

All Pages