As part of a psychology experiment, I surveyed 15 users. I separated them in two groups, those who have become smoke free, and those who are still smoking. These groups have different sizes (9 and 6).
I want to show graphically that the smoke free group reported higher values of the survey index. This is my current best attempt, with Google Sheets:
However, I think that a correct comparison should have the same number of data points. I guess I need some form of interpolation, but not sure how to proceed.
1. Would you recommend a different chart?
2. Should I have the same number of data points? If yes, how to achieve that?