document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1001735>Question 1001735</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the sample size.<BR>\n" );
document.write( "Margin of error = $125, confidence level = 95%, standard deviation = $500 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #618847 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=618847\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Assuming I can use a normal distribution, z*SE=half width of confidence interval<BR>\n" );
document.write( "125=1.96*(s/sqrt(n))<BR>\n" );
document.write( "125sqrt(n)=1.96*(500)=980<BR>\n" );
document.write( "sqrt(n)=980/125<BR>\n" );
document.write( "n=(980/125)^2<BR>\n" );
document.write( "61.47 rounded upward to 62.<BR>\n" );
document.write( "I could go back to the t-table, where t df=60(0.95)=2<BR>\n" );
document.write( "That would give a sample size of 64 (1000/125)^2 </SPAN>\n" );
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