Imagine a simple experiment with four groups, each containing three observations. For each of the following four outcomes, indicate whether or not there is variability between groups and also whether or not there is variability within groups.

You need not do any calculations, with the possible exception of an occasional group mean, in order to answer this question.

1.

2.

3.

4.

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Group A 5 Group C Group B Group D 10 11 11 10 15 16 11 12 16