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Confidence interval for the mean difference

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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?

Reference no: EM131008655

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