It is important for women to gain the right amount of weight during pregnancy by eating a healthy, balanced diet (webmd.com). It is recommended that a woman of average weight before pregnancy should gain 25 to 35 pounds during pregnancy. The accompanying table shows a portion of the weight data for 40 women before and after pregnancy; the complete data set, labeled Pregnancy_Weight, can be found on the text website.

Weight after Pregnancy Weight before Pregnancy

168................114

161................107

: ................ :

157................136

a. At the 5% level of significance, determine if the mean weight gain of women due to pregnancy is more than 30 pounds.

b. At the 5% level of significance, determine if the mean weight gain of women due to pregnancy is more than 35 pounds.