Suppose the height and weight of 30 girls in Sodor are measured. The mean and standard deviation of the heights are 46 and 7 in., respectively, and the mean and standard deviation of the weights are 94 and 15 pounds, respectively. Suppose the correlation between height and weight is 0.75.
(a) Find the equation of the least-squares regression line of weight against height.
(b) Find the predicted weight of a girl who is 5 ft. tall.
(c) Find R-squared and give a sentence interpreting this statistic.