Standard deviation of returns is often used as a measure of a mutual fund's volatility (risk). A larger standard deviation of returns is an indication of higher risk. According to Morningstaccom (June 17. 2010), the American Century Equity Income Institutional Fund. a large cap fund, has a standard deviation of returns equal to 13.35 percent. Morningstarcom also reported that the Fidelity Small Cap Discovery Fund has a standard deviation of returns equal to 28.59 percent. Each standard deviation was computed using a sample of size 31. (a) Calculate the value of the test statistic. (Do not round intermediate calculations. Round your answer to 2 decimal places.) Testsmsuc {b} Calculate the critical value by using excel. (Round your answer to 2 decimal places.) armcawanue (c) At the .05 significance level, what it the conclusion? @ Reject O Fail to reject