The file IndexReturn contains data about the performance of 38 indexes across the world as of July

Question:

The file IndexReturn contains data about the performance of 38 indexes across the world as of July 2018.

a. Construct a 95% confidence interval estimate for the mean yield of one-year returns.

b. Construct a 95% confidence interval estimate for the mean yield of five-year returns.

c. Compare the results of (a) and (b).

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