document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=460554>Question 460554</A>: <I><SPAN STYLE=\"word-break: break-all;\"> You want to estimate, with 95% confidence, the population proportion of U.S. adults who drive a car. Your estimate must be accurate within 2% of population proportion. No preliminary estimate is given. Find the minimum sample size needed. Find the minimum sample size needed, using prior study showing that 67% of U.S. adults drive a car.\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #315906 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=315906\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You want to estimate, with 95% confidence, the population proportion of U.S. adults who drive a car. Your estimate must be accurate within 2% of population proportion. No preliminary estimate is given. Find the minimum sample size needed. Find the minimum sample size needed, using prior study showing that 67% of U.S. adults drive a car. \r<BR>\n" );
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document.write( "n = [z/E]^2*pq<BR>\n" );
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document.write( "n = [1.96/0.02]^2*0.67*0.33 <BR>\n" );
document.write( "= 2124 when rounded up<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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