Overview The within-subjects (or repeated measures or paired-samples) t-test is a very common statistical method used to compare mean differences between two dependent groups. This is different than the between-subjects t-test because individuals are in both of the two comparison groups. For example, math achievement of students before and after an intervention. If the same...Read More

When to use a chi-square test: ​A chi square analysis is used when we have a categorical dependent and independent variable. Basically, we’re going to compute a cross-tabulation to ask if there’s a greater frequency of some kind of outcome event in group A compared to group B. Assumptions of the chi-square test: ​1. The...Read More