document.write( "Question 1180812: You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p = 0.13. You would like to be 96% confident that your esimate is within 2% of the true population proportion. How large of a sample size is required? \n" ); document.write( "

Algebra.Com's Answer #810597 by Boreal(15235) $\"\"$ $\"About$

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z(0.98)=2.054
\n" ); document.write( "96% half-interval is z(0.98)* sqrt(p(1-p)/n). The half-interval=error=0.02
\n" ); document.write( "error=2.054*sqrt((.13*.87)/n))
\n" ); document.write( ".02*sqrt*n)=2.054 * sqrt (.1131)
\n" ); document.write( ".02 sqrt(n)=0.6908
\n" ); document.write( "n=1192.90=1193\r
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