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? Portfolio A Portfolio B 5.12 9.02 10.91 8.63 12.48 7.52 4.13 6.77 5.64 7.53 8.52 7.14 7.80 7.75 9.76 7.75 9.68 8.67 4.81 8.83 11.64 7.59 11.36 9.88 (b-1) Choose the appropriate hypotheses. Assume d = company assessed value employee assessed value. multiple choice 2 H0: 1 - 2 = 0 vs. H1: 1 - 2 0 H0: 1 - 2 0 vs. H1: 1 - 2 < 0 H0: 1 - 2 0 vs. H1: 1 - 2 > 0 (b-2) State the decision rule for .01 level of significance. (Round your answers to 3 decimal places. A negative value should be indicated by a minus sign.) Reject the null hypothesis if Fcalc < or tcalc >