7.3.6 A test designed to measure mothers' attitudes toward their labor and delivery experiences was given to two groups of new mothers. Sample 1 (attenders) had attended prenatal classes held at the local health department. Sample 2 (nonattenders) did not attend the classes. The sample sizes and means and standard deviations of the test scores were as follows: Sample n mean 5 15 4.75 1.0 22 3.00 1.5 Do these data provide sufficient evidence to indicate that attenders, on the average, score higher than nonattenders? Let a = 0.05