I have two groups (test and control) and I wanted to determine the impact of a certain initiative on the test group. The comparison would be 4-month before the initiative and 4-month after. The starting baselines for the groups are slightly different so to calculate the impact use percentages. If the test group improves by 5% after the initiative while the control group changes by 1%. How do I determine whether the 5% change is statistically significance compared to the 1% change in the control group?
Solved – Statistical significance between two percentage change
statistical significance
Best Answer
If you have measured improvement for every member in every group, you just need to perform a t-test to test if the mean improvement percentage is different in the test group and the control group.