Choosing a Statistical Test
Statistical tests allow us to make inferences about a sample because they can validate if the differences, associations, and patterns that we detect are real and not due to chance.
There are many statistical tests that you can use and depends on the research design, the type of variable, and the distribution of the data.
If the data is normally distributed, you will choose a type of parametric test. If normality is violated, then you will need to use a test that doesn’t need the normality assumption to be valid. We call these non-parametric tests or parametric-independent tests.