Statistical Tests

On the USMLE, you will most likely be presented with a research design and according to the variables, you will be asked which statistical test to use.

 

2 interval variables: Pearson's correlation

2 ordinal variables: Spearman correlation
2 nominal variables: Chi-square
Both nominal and interval variables:

• 2 groups: t-test
• more than 2 groups: ANOVA

A mnemonic for interval vs. nominal is PINK:
Pearson = Interval
Nominal = Khi square (Chi square)

Developmental Milestones

This chart is a hybrid between the ones in Kaplan Lecture Notes, First Aid for the USMLE step 1, First aid for the basic sciences, and a few other resources. The bottom row of the table (the "others" row) has mnemonics for each age. The mnemonics cover a great deal of what's in the table, however there is still a lot of information that is not covered by the mnemonics, so you're still going to have to put in a lot of effort if you want to master this.