Question: (Continuation of Problem 8.13.) a) For the oldest child, find the regression of FEV1 on (i) weight and age; (ii) height and age; (iii) height,

(Continuation of Problem 8.13.)

a) For the oldest child, find the regression of FEV1 on (i) weight and age; (ii) height and age; (iii)

height, weight, and age. Compare the three regression equations. In each regression, which coefficients are significantly different from zero?

b) Find the correlation matrix for the four variables. Which pair of variables is most highly correlated? least correlated? Heuristically, how might this explain the results of part (a)?

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