Problem 3-26 The following data were collected during a study of consumer buying patterns: Observation 1 2 3 4 14 28 43 36 51 52 28 70 78 88 77 98 94 86 Observation 8 9 10 11 12 13 19 10 18 23 24 28 y 76 65 72 86 89 89 5 6 7 b. Obtain a linear regression line for the data (Round your intermediate calculations and final answers to 3 decimal places.) y= 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 = 49. (Round your intermediate calculations and final answers to 3 decimal places.) y=