What test for significance is best to use to test the difference between the change of a categorical variable in a control group and the change in a pilot group?
I do not think I can simply compare the 'after' for each because the 'before' for the two groups was statistically different - they did not start out the same so I believe I can only analyze the change within each group.
I used the two-tailed, two-proportion z-test for within group differences.
I do not think I can simply compare the 'after' for each because the 'before' for the two groups was statistically different - they did not start out the same so I believe I can only analyze the change within each group.
I used the two-tailed, two-proportion z-test for within group differences.