document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=450489>Question 450489</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A private opinion poll is conducted for a politician to determine what proportion of the population favors adding more national parks. How large a sample is needed in order to be 99% confident that the sample proportion will not differ from the true proportion by more then 5% </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #309858 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=309858\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A private opinion poll is conducted for a politician to determine what proportion of the population favors adding more national parks. How large a sample is needed in order to be 99% confident that the sample proportion will not differ from the true proportion by more then 5%<BR>\n" );
document.write( "-----------<BR>\n" );
document.write( "n = [z/E]^2*(pq)<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "Use p = 1/2 = q as the least biased estimate of p.<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "n = [2.5758/0.05]^2*(0.5)^2 <BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "= 664 when rounded up<BR>\n" );
document.write( "========================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "============== </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );