Question: Using data from the past 25 years, an investor wants to test whether the average return of Vanguards Precious Metals and Mining Fund is greater

Using data from the past 25 years, an investor wants to test whether the average return of Vanguard’s Precious Metals and Mining Fund is greater than 12%. Assume returns are normally distributed with a population standard deviation of 30%.
a. State the null and the alternative hypotheses for the test.
b. Open the Metals data from the text website into an Excel spreadsheet. Use the function Z.TEST to calculate the p-value.
c. At α = 0.05 what is the conclusion? Is the return on Vanguard’s Precious Metals and Mining Fund greater than 12%?

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