Not happy with the previous results, the analyst in Exercise 2 takes a much larger random sample of customers from each website and records their page views. Here are the data:

Website AWebsite B

n1 = 80 ..........n2 = 95

y1 = 7.7 pages.....y2 = 7.3 pages

s1 = 4.6 pages .....s2 = 4.3 pages

a) Find the estimated mean difference in page visits between the two websites.

b) Find the standard error of the estimated mean difference.

c) Calculate the t-statistic for the observed difference in mean page visits assuming that the true mean difference is 0.