4. A longitudinal study reported the following data for eight children on their age at first walking (in months) and their first grade teachers' ratings of athletic ability (on a 9-point scale):

Child Age Walking (in months) X Athletic Rating Y

A 12 5

B 10 4

C 10 6

D 16 7

E 12 2

F 11 2

G 13 3

H 14 4

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4A. Create the regression equation that predicts the athletic rating based on the age of walking (in months). (3 points)

4B. Suppose a child started walking at 15 months. Estimate the athletic rating this child would receive. (1 point)

4C. At what point does the regression line cross the y-axis? (1 point)

4D. For every unit increase in age of walking (1 month), how much would you predict the athletic rating would change? (1 point)