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A manager at a car wash company in Missouri wants to measure the effectiveness of price discounts and various types of advertisement expenditures on sales. For the analysis, he uses varying price discounts (Discount), advertisement expenditures on radio (Radio), newspapers (Newspaper), and digital (Digital), in 21 counties in Missouri. Data about the monthly sales (in $1,000s), price discounts (in percent), and advertisement expenditures (in $1,000s) on radio, newspaper, and digital were collected. The partial Minitab follows. Source DF SS MS F Regression 300 Error Total 1400 I. The test statistic used to determine if there is a relationship among the variables equals II. The F value obtained from the table used to test if there is a relationship among the variables at a 5% level equals III. Carry out the test to determine if there is a relationship among the variables at the 5% level. What is the appropriate conclusion for this test? a. Reject Ho: There is a significant relationship between the variables. b. Reject Ho: There is a significant relationship among the variables, and all the independent variables are significant. c. Fail to reject Ho: There is insufficient evidence to conclude a significant relationship exists among the variables. e. Fail to reject Ho: There is evidence to conclude that all independent variables are not significant. The letter corresponding to your answer is: I V. What percentage of the total variation in the dependent variable can be explained by the regression equation? V. What is the value of the adjusted R-squared