96. An investment analyst wants to examine the relationship between a mutual fund's return, its turnover rate and its expense ratio. She randomly selects 10 mutual funds and estimates: Return = Bo + Bj Turnover + 32 Expense + &, where Return is the average five-year return (in %), Turnover is the annual holdings turnover (in %), Expense is the annual expense ratio (in %), and & is the random error component. A portion of the regression results is shown in the accompanying table. ANOVA SS MS F Significance F Regression 93.33 46.67 4.90 0.047 Residual 66.69 9.53 Total 160.02 Coefficients Standard Error t Star p-value Intercept 30.60 4.30 7.12 0.000 Turnover 0.13 0.06 2.23 0.061 Expense 0,90 4.08 0.22 0.831 a. At the 10% significance level, are the explanatory variables jointly significant in explaining Return? Explain. b. At the 10% significance level, is each explanatory variable individually significant in explaining Return? Explain