The following data were collected during a study of consumer buying patterns: Observation Observation y 12345 19 72 8 28 77 2 21 81 9 17 73 3 43 79 10 13 77 4 28 81 11 28 85 5 56 98 12 28 93 6 49 96 13 34 94 7 32 82 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.)