For the data and sample regression equation shown below, do the following. a. Decide, at the 5% significance level, whether the data provide sufficient evidence to conclude that x is useful for predicting y. b. Find a 95% confidence interval for the slope of the population regression line. X 3 4 1 20 y 5 8 9 - 1 y = 4.5 +0.3x, _x; = 10, Ex;2 = 30, b, = 0.3, and Se = 5.4909 a. What are the hypotheses for the test? O A. Ho: By = 0 and Ha: B1 # 0 O B. Ho: B1 = 0 and Ha: By > 0 O C. Ho: By # 0 and Ha : B1 = 0 O D. Ho: By = 0 and Ha: By