Question

A regional automotive parts chain store firm wants to improve the sales of tune- up supplies. It believes that a TV ad with a popular local, but offbeat, know-it-all actor might be able to affect their sales. Before the ads are run on TV, the company randomly samples eight of its weekly sales from the past years. Following the ad campaign, seven weeks of sales were sampled. Weekly sales are approximately normally distributed and the population standard deviations are equal. Their hypothesis test is: Did the TV ad campaign help sales? To answer this question, the company plans to use a 0.05 significance level. The results of the two samples are:

Before Ad Campaign	After Ad campaign​
n1 = 8	n2 = 7
x̅1 = 174​	x̅2 = 189
s12 = 484	s22 = 400

Answer 1

TOPIC:Two independent sample t-test for the population means.