Table 1.3 lists the ages and weights of nine girls.

(a) Find the linear regression equation for the data.
(b) Find the slope of the regression line. What does the slope represent?
(c) Superimpose the graph of the linear regression equation on a scatter plot of the data.
(d) Use the regression equation to predict the approximate weight of a 30-month-old girl.

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Table 1.3 Girls' Ages and Weights Age (months) 19 21 24 27 29 31 34 38 43 Weight (pounds) 22 23 25 28 31 28 32 34 39