A webmaster wants to know if a website he designed is showing increased page views per visit. A customer is randomly sent to one of tow different websites, offering the same products, but with different designs. The page views are below:

web a web b

9 10

4 13

10 2

7 3

4 7

a. Test the null hypothesis that the mean number of page visits is the same for the two websites. What do you conclude a alpha = 0.05? (Use df = 7)

b. Find a 95% confidence interval for the mean difference in page views from the tow websites.

c. Where is 0 and what does that say about the null hypothesis that the mean difference is 0?