document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=296923>Question 296923</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can you please tell me how large of a sample is required so that the margin of error = .04 with a 99% confidence interval? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #213875 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=213875\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  Can you please tell me how large of a sample is required so that the margin of error = .04 with a 99% confidence interval?<BR>\n" );
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document.write( "Margin of error depends on the z associated with the confidence level,<BR>\n" );
document.write( "the standard deviation and the sample size.<BR>\n" );
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document.write( "Your data leaves two variables unknown:<BR>\n" );
document.write( "0.04 = 2.5758*s/sqrt(n)<BR>\n" );
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document.write( "The value of \"n\" depends on the value of \"s\".<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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