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Rates of return (annualized) in two investment portfolios are compared over the last 12 quarters. They are considered similar in safety, but portfolio B is
Rates of return (annualized) in two investment portfolios are compared over the last 12 quarters. They are considered similar in safety, but portfolio B is advertised as being "less volatile." (a) At = .025, does the sample show that portfolio A has significantly greater variance in rates of return than portfolio B? (b) At = .025, is there a significant difference in the means?