Question: 22. The data in Problem 2 1 showed a mean difference of 3 points between the training group and the no-training group (M = 8

22. The data in Problem 2 1 showed a mean difference of 3 points between the training group and the no-training group (M = 8 versus M = 5). Because there is a 3-point difference, you would expect to find that quiz scores are related to training (there is a nonzero correlation).

Now consider the following data, where there is no mean difference between the two groups:

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