A Summary of Variance
Comparison Test Procedures
Using the equations on the previous pages we have established all the statistical data we need to conduct the hypothesis test. One question remains: What is our Hypothesis ? Because we have established that s21 > s22, we have a choice between two possible hypotheses:
The latter of the two, 21 22 , naturally implies a right-tailed hypothesis test. There are no left-tailed tests. The former, 21 = 22 is the more common test and requires a two-tailed test. How do we find the significance level ?
Procedure used to determine significance level
Case Example: Pain Medication and Response Time