The following data were collected during a study of consumer buying patterns: Observation x y Observation x y 1 20 70 8 16 75 2 21 79 9 17 72 3 38 86 10 17 71 4 32 86 11 27 90 5 48 93 12 19 93 6 46 95 13 38 94 7 28 79 b. Obtain a linear regression line for the data.(Round your intermediate calculations and final answers to 3 decimal places.) y = + x c. What percentage of the variation is explained by the regression line? (Do not round intermediate calculations. Round your answer to the nearest whole percent. Omit the "%" sign in your response.) Approximately % of the variation in the dependent variable is explained by the independent variable. d. Use the equation determined in part b to predict the expected value of y for x = 44. (Round your intermediate calculations and final answers to 3 decimal places.) y =