3. Two methods for teaching reading were applied to two randomly selected groups of elementary schoolchildren and then compared on the basis of a reading comprehensive test given at the end of the...

Extracted text: 3. Two methods for teaching reading were applied to two randomly selected groups of elementary schoolchildren and then compared on the basis of a reading comprehensive test given at the end of the learning period. The results are given in the following table. Method I Method II Sample size Mean 11 14 64 69 variance 52 71 Do the data present sufficient evidence to indicate a difference in the mean scores for the populations associated with the two teaching methods? What can be said about the attained significance level? What assumptions are required? Check your assumption by an appropriate method. What would you conclude at the 5% level of significance?