Results from a regression model analysis are shown below. The numbers below the coefficient estimates are the sample standard errors of the coefficient estimates. a. Compute two-sided 95% confidence intervals for the three regression slope coefficients. B b. For each of the slope coefficients, test the hypothesis Ho: B=0 against the appropriate one-sided alternative. Use a = 0.05. y=-24.50+15.4x -1.7x2-35.1x3 (8.1) (5.6) (15.9) R=0.75 n = 21 Click the icon to view a table of critical values for the Student's t distribution. a. What is the 95% confidence interval for the coefficient of x,? -1.6