# My Favorite One-Liners: Part 23

In this series, I’m compiling some of the quips and one-liners that I’ll use with my students to hopefully make my lessons more memorable for them.

Here are some sage words of wisdom that I give in my statistics class:

If the alternative hypothesis has the form $p > p_0$, then the rejection region lies to the right of $p_0$. On the other hand, if the alternative hypothesis has the form $p < p_0$, then the rejection region lies to the left of $p_0$.

On the other hand, if the alternative hypothesis has the form $p \ne p_0$, then the rejection region has two parts: one part to the left of $p_0$, and another part to the right. So it’s kind of like my single days. Back then, my rejection region had two parts: Friday night and Saturday night.

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