1.The following data concerning the birth weight (in grams) of newborns resulted from a study that attempted to determine the effect of maternal smoking on unborn babies.

Nonsmokers: Smokers:

n = 1820 m = 1340

X = 3480 grams Y = 3260 grams

Sx = 9.2 grams Sy = 10.4 grams

(a) Test the hypothesis, at the 5 percent level of significance, that the mean weight of a newborn is the same whether or not the mother is a smoker.

(b) What is the p value in part (a)?