I cheat. Well, I use “cheat” sheets. I’ve had plenty of statistics training, but honestly, my brain just doesn’t want to hold onto the assumptions associated with this or that test. So I create little charts or tables, which I reference often. This frees up brain space to continually reassess the pros and cons of buying a used Jeep Wrangler vs. a Subaru WRX (three years strong, and I still haven’t decided).
Anyway…here’s a quick reference guide for choosing a statistical test:
Answer the following questions:
- What is my variable type?
- Are the comparison group data paired or unpaired? (i.e., can you link data from individual respondents in the two comparison groups or not)
- What is the sample size?
Once you’ve answered these questions, use the following to identify which statistical test of significance to use: