document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1171704>Question 1171704</A>: <I><SPAN STYLE=\"word-break: break-all;\"> For a test market, find the sample size needed to estimate the true proportion of consumers satisfied with a certain new product within ±0.04 at the 90 percent confidence level, assume you have no strong feeling about what the proportion is<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 #796620 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=796620\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the half-interval is z(0.95)*sqrt(p(1-p)/n)<BR>\n" );
document.write( "z is 1.645<BR>\n" );
document.write( "p=0.5<BR>\n" );
document.write( "1.645*sqrt(0.25/n)=0.04<BR>\n" );
document.write( "sqrt(0.25/n)=0.0243<BR>\n" );
document.write( "square both sides<BR>\n" );
document.write( "0.25/n=0.00059127<BR>\n" );
document.write( "n=422.81 round to 423.\r<BR>\n" );
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