Conversation so far:
when do you do a post hoc test
Post hoc tests should only be run when you have a shown an overall statistically significant difference in group means.
what does statistically significant difference in group means mean
a statistically significant one-way ANOVA result
what does one-way mean in reference to ANOVA tests
One-way has one independent variable

Question: what kind of test is it
Self-contained rewrite: what kind of test is an ANOVA test