Problem 4 A bank's investment-grade index achieved a 7 percent annual return. A fund manager at Green Mutual was interested in determining whether the average return of a group of bond mutual funds underperforrned the index. She obtained a random sample of 10 annual returns from the group and determined the following: Annual Return Mean 7.130 Standard Error 0.125 Standard Deviation 0.395 H0 p 2 7 Ha ,u