Question: A research study comparing three treatment conditions produced means of =2, =4, and =6.

1. Compute the variance for the set of three means. (Treat the means as a sample of n=3 values and compute the sample variance.)
2. Now we will change the third mean from =6 to =15. Notice that we have substantially increased the differences among the three means. Compute the variance for the new set of n=3 means. You should find that the variance is much larger than the value obtained in part a. Note: The variance provides a measure of the size of the mean differences.

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