1. A random sample of infant girls was obtained, and the weight (in kilograms) and age (in months) for each is given in the following table. Age 33 32 14 20 15 16 30 17 21 23 Weight 12.9 13.8 8.2 12.2 8.5 12.9 13.7 11.2 11.9 10.4 a. Find the estimated regression line. b. Estimate the true mean weight of a 22-month-old girl