Solution) The results of the following three experiments where the means of the two groups being compared are
Question: The results of the following three experiments where the means of the two groups being compared are exactly the same but the standard deviation is quite different from experiment to experiment. Compute the effect size using the formula on page 198 and then discuss why this size changes as a function of the change in variability.
| Experiment 1 | Group 1 Mean | 78.6 | |
| Group 2 Mean | 73.4 | ||
| Standard Deviation | 2 | ||
| Experiment 2 | Group 1 Mean | 78.6 | |
| Group 2 Mean | 73.4 | ||
| Standard Deviation | 4 | ||
| Experiment 3 | Group 1 Mean | 78.6 | |
| Group 2 Mean | 73.4 | ||
| Standard Deviation | 8 |
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