Post Hoc Tests
Consider the different post hoc
tests discussed in the readings and respond to the following:
Describe the general rationale
behind using post hoc tests (i.e., when they are used and why).
One of the advantages of using an
ANOVA (compared to using t-tests) is also a disadvantage—using an ANOVA makes
it necessary to use post hoc tests if there is a significant main effect. We
use a post hoc test because there is one specific advantage in using an ANOVA.
Explain why using an ANOVA naturally leads to the need to have post hoc tests
(hint: consider what you are examining when you conduct a post hoc analysis).
Conducting a post hoc test is
similar to conducting multiple t-tests. As a result, it would seem natural to
want to bypass the ANOVA and just use repeated t-tests. Explain why this
approach is not necessarily a good idea and why an ANOVA followed by a post hoc
analysis is beneficial.
Describe an experimental
hypothesis and explain which post hoc test you would use if you find a
significant overall effect. Include in your explanation the pros and cons of
each test in making your decision.
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