Problem 1.55 Refer to the infant weight gain data in Example 1.7 (Table 1.6).

(a) Compute the sample mean, sample variance and sample standard deviation of the infant weight gain for smoking mothers.

(b) Compute the sample mean, sample variance and sample standard deviation of the infant weight gain for non-smoking mothers.

(c) Using the results of parts

(a) and

(b) above compare the two populations with respect to the effect, if any, that smoking has on infant weight gain.