Nurses interested in the effect of prenatal care divided 18 expectant mothers into two groups of size 9. Group 1 received prenatal consultations, while those in group 2 received no prenatal consultations. The summary statistics on birth weight for group 1 are x1 = 99.6 ounces and s1 = 6.82 ounces for group 1, respectively x2 = 85.3 ounces and s2 = 16.75 ounces for group 2. Construct a 95% confidence interval for 1 2, where 1 denotes the average birth weight for babies whose mothers received prenatal consultations, and 2 denotes the average birth weight for babies whose mothers received no prenatal consultations. Using this interval, can we conclude that babies whose mothers did not receive prenatal consultations have a smaller weight at birth? Assume that the two populations are normal with unequal variances.