document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=925519>Question 925519</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A car dealership is interested in finding out how many people are considering buying a new car. How many people <BR>\n" );
document.write( "must be surveyed so they can be 99% confident that the sample proportion is within three percentage points of the <BR>\n" );
document.write( "true proportion?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #561573 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=561573\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A car dealership is interested in finding out how many people are considering buying a new car. How many people <BR>\n" );
document.write( "must be surveyed so they can be 99% confident that the sample proportion is within three percentage points of the <BR>\n" );
document.write( "true proportion? <BR>\n" );
document.write( "----<BR>\n" );
document.write( "n = [z/E]^2*pq<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "n = [2.5758/0.03]^2*(1/2)(1/2)<BR>\n" );
document.write( "------<BR>\n" );
document.write( "n = 1843 when rounded up.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );