Not happy with the previous results, the analyst in Exercise 2 takes a much larger random sample of cus- tomers from each website and records their page views. Here are the data:
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Website 1
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Website 2
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n1 = 80
y 1 = 7.7 pages
s1 = 4.6 pages
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n2 = 95
y 2 = 7.3 pages
s2 = 4.3 pages
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a) Find the estimated mean difference in page visits be- tween 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.