Cortisol level determinations were made on two samples of women at childbirth. Group 1 subjects underwent emergency cesarean section following induced labor. Group 2 subjects delivered by either cesarean section or the vaginal route following spontaneous labor. The sample sizes, mean cortisol levels, and standard deviations were as follows:

Sample n x s 1 10 435 65 2 12 645 80 Do these data provide sufficient evidence to indicate a difference in the mean cortisol levels in the populations represented? Let a ¼ :05.