Given the following least-squares regression equation: ŷ = -13.586 +4.340x where x represents the age of an elementary school student and y represents the score on a standardized test. (a) Interpret the value of the slope in this equation in the context of this data. (b) Give the y-intercept, and explain why it does not make sense in this situation. (c) Use the regression equation to predict the score on this standardized test for a student who is 8 years old. (d) Use the regression equation to predict the age of a student who scores a 35 on the standardized test. The least-squares regression line is ý = -13.586 + 4.340x, where x represents the age of an elementary school student and y represents the score on a standardized test.

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