Suppose that a multiple regression has k=5 explanatory variables. The coefficient of determination, R, is found to be 0.776 based on a sample of n= 20 observations (a) Compute the adjusted R. (b) Compute the F-test statistic. (c) If one additional explanatory variable is addd to the model and R increases to 0.795, compute the adjusted R. Would you recommend adding the additional explanatory variable to the model? Why or why not? (a) R (Round to three decimal places as needed.) ad) (b) Fo = (Round to three decimal places as needed.) (c) R = (Round to three decimal places as needed.) Since the proportion of explained variation V adding the additional explanatory variable to the model recommended.