document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=555587>Question 555587</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am really confused.  I am in MM207 and do not understand how to solve this problem.  Could someone please take me step by step through it so that I understand what I am doing?<BR>\n" );
document.write( "Assume you want to estimate with the proportion of students who commute less than 5 miles to work within 2%, what sample size would you need? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #361849 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=361849\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Assume you want to estimate with the proportion of students who commute less than 5 miles to work within 2%, what sample size would you need?<BR>\n" );
document.write( "---<BR>\n" );
document.write( "As I told you two days ago, you have to know the confidence level<BR>\n" );
document.write( "for your problem because:<BR>\n" );
document.write( "n = [z/E]^2*pq<BR>\n" );
document.write( "---<BR>\n" );
document.write( "If the confidence level is 95%, then z = 1.96<BR>\n" );
document.write( "Since you have no p-value you use p = 1/2 = q<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Then you would get:<BR>\n" );
document.write( "n = [1.96/0.02]^2*(1/2)(1/2) = 2401<BR>\n" );
document.write( "========================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "================ </SPAN>\n" );
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