Check my work Rates of return (annualized) in two investment portfolios are compared over the past 12 quarters. They are considered similar in safety, but portfolio B is advertised as being "less volatile." (a) At a = .025, does the sample show that portfolio A has significantly greater variance in rates of return than portfolio B? (b) At a = .025, is there a significant difference in the means? 2 points Portfolio A Portfolio B 5. 23 8.96 10.91 8. 60 12. 49 7. 61 4. 17 6. 60 eBook 5.54 7.77 8. 68 7.06 7.89 7. 68 9. 82 7. 62 9. 62 8.71 References 4.93 8. 97 11. 66 7.71 11. 49 9. 91 Click here for the Excel Data File (a-1) Choose the appropriate hypotheses. Assume OA is the variance of the Portfolio A and OB is the variance of the Portfolio B. Ho: OA 2/0B2 51 versus H1: 0A 2/0B2 > 1 Ho: OA2/082 =1 versus H1: 0A2/0B2# 1 Ho: 0A 2/0B2 21 versus Hy: 0A2/0B2