For our test, we found our weaknesses to be; students who recently quit playing sports would not have any hours in extra-curriculars, and have a low cumulative due to that. A bias that our study had, was not having taken any data from freshman and sophmores. We do not feel comfortable extrapolating our data, but we should extend our sample to all northeastern Ohio schools. Also we would need to eliminate the bias, and extend the study to all hours spent in one year in extra-curricular activities.  To replicate this test, and have better results, we could take data from freshman, sophmores, juniors, and seniors, and increase our sample size.