document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1182932>Question 1182932</A>: <I><SPAN STYLE=\"word-break: break-all;\"> You want to obtain a sample to estimate a population proportion.<BR>\n" );
document.write( "Based on previous evidence, you believe the population proportion is 58%.<BR>\n" );
document.write( "You would like to be 99% confident that your estimate is within 2.5% of the true population proportion.<BR>\n" );
document.write( "How large of a sample size is required?<BR>\n" );
document.write( "Do not round mid-calculation.\r<BR>\n" );
document.write( "\n" );
document.write( "n= </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #813091 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=813091\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> error=z(2.5768)*sqrt(0.58*0.42/n)<BR>\n" );
document.write( "0.025^2=z^2*0.58*0.42/n<BR>\n" );
document.write( "n=z^2*0.58*0.42/0.025^2<BR>\n" );
document.write( "=2586.01 or 2587 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );