Nurses who are interested in the effect of antenatal care divided a group of 18 pregnant women into two groups of size 9. Group 1 received antenatal care, while the women in group 2 have not received antenatal consultations. Descriptive statistics for birth weight are x 1 = 99.6 ounces and s1 = 6.82 ounces for group 1, respectively x 2 = 85.3 ounces and s2 = 16.75 ounces for group 2. Give a 95% confidence interval for 1 - 2, where 1 is the mean birth weight for infants of women who received antenatal visits, and 2 is the mean birth weight. birth for babies of women who have not received antenatal care. Using this interval, can it be concluded that women who have not received antenatal care have babies with a lower weight? Suppose that the two populations follow normal laws of unequal variances.