Question: Using the summary statistics in Exercise 4 and assuming that

Using the summary statistics in Exercise 4, and assuming that the data come from a distribution that is normally distributed,
a) Find a 95% confidence interval for the mean difference in page views from the two websites.
b) Why is the confidence interval narrower than the one you found in Exercise 10?
c) Is 0 within the confidence interval?
d) What does it say about the null hypothesis that the mean difference is 0?

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