(6) A multiple regression model has the form , = 100 + 120" + 90# As # increases by 1 unit and hold " constant, , is expected to_____ a. increase by 90 units b. decrease by 90 units c. increase by 120 units d. decrease by 120 units (7) If all the points of a scatter diagram lie on the least squares regression line, then the coefficient of determination for these variables based on these data _____. a. is 0 b. is 1 c. is either 1 or -1, depending upon whether the relationship is positive or negative d. could be any value between -1 and 1 (8) In a regression study, a 95% confidence interval for 1 was given as: (-5.65, 2.61). What would a test for !: " = 0 vs ": " 0 conclude? a. reject the null hypothesis at =0.05 and all smaller b. fail to reject the null hypothesis at =0.05 and all smaller c. reject the null hypothesis at =0.05 and all larger d. fail to reject the null hypothesis at =0.05 and all larger (9). Which of the following is not an assumption made about the random deviation in a simple linear regression model? a. The distribution of is normal. b. The mean of is + c. The standard deviation of is constant for all values. d. ", #,..., $ are independent of one another. (10). At the same confidence level, a prediction interval for a new response is always: a. somewhat larger than the corresponding confidence interval for the mean response b. somewhat smaller than the corresponding confidence interval for the mean resp