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difference between post hoc tests and a priori comparisons

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1. Explain the difference between post hoc tests and a priori comparisons. Why are post hoc tests more conservative than a priori comparisons?

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Solution Summary

The difference between post hoc tests and a priori comparisons is highlighted. Why are post hoc tests more conservative than a priori comparisons are determined.

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Post hoc tests and a priori comparisons allow us to delve futher into where exactly group differences lie. They are used after an analysis (such as ANOVA) that reveals a difference somewhere between means to allow us to determine exactly which means differ from one another. For example, if you're comparing Groups A, B, and C using ANOVA and find a significant difference, you know only that there is a difference between at least two of the means. Post hoc and a priori tests allow us to test whether Group A is different from B and C, and whether B and C are different from one another, or whether some of those pairwise differences are nonsignificant.

That is the similarity between post hoc and a priori tests. The difference is mainly a theoretical ...

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