document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1119720>Question 1119720</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A political candidate has asked you to conduct a poll to determine what percentage of people support her.\r<BR>\n" );
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document.write( "If the candidate only wants a 8% margin of error at a 99% confidence level, what size of sample is needed? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #735376 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=735376\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the error is from the standard error*z<BR>\n" );
document.write( "e=z*sqrt(p*(1-p)/n))<BR>\n" );
document.write( ".08=2.576*sqrt(p*(1-p)/n))<BR>\n" );
document.write( "square both sides<BR>\n" );
document.write( "0.0064=6.64*.5*.5/n, using .5, which is the most conservative estimate since it is the p that maximizes the error value<BR>\n" );
document.write( "0.0064=1.66/n<BR>\n" );
document.write( "n=259.4 or 260<BR>\n" );
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