A Post hoc tests are performed in the following circumstances: 1 If there is a l

Question

A Post hoc tests are performed in the following circumstances: 1 If there is a large difference between the means of three groups 2 If there is a large difference in the variability of three groups 3 If the F test for ANOVA exceeds the critical value of F for the assigned alpha 4 All of the above B Which of the following properties of the ANOVA (F) Distribution is true The F statistic is left skewed and always positive. The F statistic is right skewed and always positive. The F statistic is normally distributed and always positive. None of the above Which of the following are assumptions associated with Analysis of Variance. Check all that are true! homoscedasticity Equal Variances Approximately Normally Distributed population Random and Independent Samples

Explanation / Answer

A) Post hoc tests are designed for situations in which the researcher has already obtained
a significant omnibus F-test with a factor that consists of three or more means and additional
exploration of the differences among means is needed to provide specific information on which
means are significantly different from each other.

Hence option 4 is right.

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