I have a homework question that's driving me crazy:
How many times do we need to toss a coin so that with prob. .9 the discrepancy of the relative frequency of appearance of heads from 1/2 is less than .02.
My initial thought was to somehow use a normal curve and solve for N, but I'm stuck and can't figure out what to do.
I guess I'm also having issue understanding the question itself.
Any thoughts? (Please don't solve the problem, I want to learn how to do it.)