D Question 2 Suppose that you have a multiple regression with three explanatory variables. Which of the following are accurate statements of the ANOVA alternative hypothesis? Check all that apply. O The regression is useful. The regression is significant. O The regression is insignificant. O All slope coefficients equal zero. The regression is not useful At least one slope coefficient is non-zero. D Question 3 If R2=.68, bo=15, b1=30 and b2=-50 in a multiple regression with two explanatory variables (X1 and X2) and both explanatory variables are significant and the ANOVA p-value is 0.03, answer the following question: Predict the value of Y when X1=6 and X2=2. Assume both of those values are within the respective sample ranges. D Question 4 If R2=.68, bo=15, b1=30 and b2=-50 in a multiple regression with two explanatory variables (X1 and X2) and both explanatory variables are significant and the ANOVA p-value is 0.03, answer the following question: If the units on Y are dollars and the units on X1 are hours, how many more dollars are predicted when the value of X1 increases by 3 hours, holding the value of X2 constant