Three classes of student exam scores are compiled. Using SPSS to explore the data provided, determine the following:
a. Consider the post hoc contrasts between the different groups. Do any groups stand out?
b. Using the results from part (a), test the hypothesis that mean test score of one group differs from those of the other two.
A. Using SPSS, post hoc constants are shown to have significant differences between Class 3 and
the other two classes. This is significant at a level < .001.
B. The test for homogeneity suggests that we can assume equal variances. Then, with coefficients
.5, .5, and -1, the a priori contrasts suggest a difference of 13.0 between the means, at
a significance level of less than .001. Thus, we can reject the null hypothesis and conclude
confidently that the results of Class 3 were statistically different from those of Classes 1 and 2.
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