A sample of 32 money-market mutual funds was chosen on January 1, 1996, and the average annual rate of return over the past 30 days was found to be 3.23 percent, and the sample Standard deviation was 0.51 percent. A year earlier, a sample of 38 money-market funds showed an average rate of return of 4.36 percent, and the sample standard deviation was 0.84 percent. Is it reasonable to conclude (at α = 0.05) that money-market interest rates declined during 1995?
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