SOLUTION: You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estimation for the population proportion. You would like

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Question 1197341: You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estimation for the population proportion. You would like to be 90% confident that you estimate is within 2.5% of the true population proportion. How large of a sample size is required?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi  
 90% confident ⇒  z = 1.645, 
p = .50(Generally .5 is used if p is not given)  ME = .025
How large of a sample size is required?
n = %28z%2FME%29%5E2+%28p%281-p%29%29%29
n = %281.645%2F.025%29%5E2+%28.5%28.5%29%29%29 = 1082.41  0r sample Size = 1083 (always round Up)

 = CI	z = value
90%	z =1.645
92%	z = 1.751
95%	z = 1.96
98%	z = 2.326
99%	z = 2.576
Wish You the Best in your Studies.