Two methods for teaching reading were applied to two randomly selected groups of elementary schoolchildren and then compared on the basis of a reading comprehension test given at the end of the learning period. The sample means and variances computed from the test scores are shown in the accompanying table.
Do the data present sufficient evidence to indicate a difference in the mean scores for the populations associated with the two teaching methods?
a What can be said about the attained significance level, using the appropriate table in the appendix?
b Applet Exercise What can be said about the attained significance level, using the appropriate applet?
c What assumptions are required?
d What would you conclude at the α = .05 level of significance?