Suppose that a 2 × 2 factorial design is conducted to determine the effects of caffeine and sex on scores on a 20-item English test. The cell means are given in the following table.

a. Given that n = 7 and MSW = 2.0, compute the appropriate F ratios, and test each for significance at the .05 level.

b. Graph the cell means for these data. What type of interaction do you see: ordinal or disordinal?

c. Test all of the simple main effects. What specific conclusions can you draw from these tests?

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Caffeine factor Caffeine Place bo Sex Males X = 17.3 X = 12.0 Females X-12.3 |X = 16.4