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%?

  • CreatedJanuary 28, 2015
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