11 Oct '11 15:44

I figure that mathematics is a science, so I hope I have the right forum.

I need to determine what level of sample size is necessary to generate statistically reliable data for exam results. In other words, if I give an exam to X random college students, I want to be able to assert that based on those results, I can be confident that Y% of random students will generate the same average score, within Z points either way.

I know very little about statistics in general (never even had a college course in it), so I hope:

1) That I am clear enough as to what I'm looking for; and

2) Someone can give me a layman's tip on how to make that determination.

Thanks!

I need to determine what level of sample size is necessary to generate statistically reliable data for exam results. In other words, if I give an exam to X random college students, I want to be able to assert that based on those results, I can be confident that Y% of random students will generate the same average score, within Z points either way.

I know very little about statistics in general (never even had a college course in it), so I hope:

1) That I am clear enough as to what I'm looking for; and

2) Someone can give me a layman's tip on how to make that determination.

Thanks!