SOLUTION: We wish to estimate the prevalence of asthma at a large school of 1700 children.  We think it will be around 15% and want a sample size that allows the 99% confidence limits to be

Algebra ->  Probability-and-statistics -> SOLUTION: We wish to estimate the prevalence of asthma at a large school of 1700 children.  We think it will be around 15% and want a sample size that allows the 99% confidence limits to be       Log On


   

Question 751870: We wish to estimate the prevalence of asthma at a large school of 1700 children.  We think it will be around 15% and want a sample size that allows the 99% confidence limits to be within 5% of our final estimate.  TO THE NEAREST 10 CHILDREN (no decimal places), what is the minimum sample size expected to achieve this?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
We wish to estimate the prevalence of asthma at a large school of 1700 children. We think it will be around 15% and want a sample size that allows the 99% confidence limits to be within 5% of our final estimate. TO THE NEAREST 10 CHILDREN (no decimal places), what is the minimum sample size expected to achieve this?
-----
n = [z/E]^2*pq
----
n = [2.5758/0.05]^2*0.15*0.85 = 338
======================================
Cheers,
Stan H.
====================