document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1076549>Question 1076549</A>: <I><SPAN STYLE=\"word-break: break-all;\"> You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately <BR>\n" );
document.write( "p&#8727;=13%. You would like to be 90% confident that your esimate is within 0.2% of the true population proportion. How large of a sample size is required? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #691261 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=691261\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately <BR>\n" );
document.write( "p&#8727;=13%. You would like to be 90% confident that your estimate is within 0.2% of the true population proportion. How large of a sample size is required? Si<BR>\n" );
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document.write( "Since E = z*sqrt[p*q/n]<BR>\n" );
document.write( "n = [z/E]^2*p*q<BR>\n" );
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document.write( "Ans: n = [1.645/0.02]^2*0.13*0.87 = 766 when rounded up<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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