What is the purpose of "post hoc" tests?
a. These determine where the pair(s) of statistically significant differences between the means exist(s) when ANOVA flags that at least one pair of means has a statistically significant difference.
b. These are used with online surveys to provide a way for the manager to assess the meaningfulness of the difference between two means or percentages in very large sample difference testing.
c. They test the null hypothesis that no differences exist between two group means (or percentages).
d. They are "after-the fact" confirmation for all differences tests.
e. They are tests to determine if differences are stable.
Answer: a. These determine where the pair(s) of statistically significant differences between the means exist(s) when ANOVA flags that at least one pair of means has a statistically significant difference.