Presented below are four questions you should ask and answer when trying to determine which statistical procedure is most appropriate to test your hypothesis.

• What are the independent and dependent variables?
• What is the scale of measurement of the study variables?
• How many samples/groups are in the design?
• Have I met the assumptions of the statistical test selected?

To determine which test should be used in any given circumstance, we need to consider the hypothesis that is being tested, the independent and dependent variables and their scale of measurement, the study design, and the assumptions of the test.