document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=479410>Question 479410</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The Pizza Shop wanted to determine what proportion of its customers ordered only cheese pizza. Out of 80 customers surveyed, 15 ordered cheese pizza. What is the 99% confidence interval of the true proportion of customers who order only cheese pizza?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #328502 by </B><A HREF=/tutors/aboutme.mpl?userid=edjones><B>edjones(8007)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=edjones><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=edjones><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=328502\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> p=15/80=.1875, q=.8125, <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sigma=sqrt%28%28.1875%2A.8125%29%2F80%29=.0436 ALIGN=MIDDLE  ALT=\"sigma=sqrt%28%28.1875%2A.8125%29%2F80%29=.0436\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(a,b)=.1875 +-(2.576*.0436) [2.576 is the area under the normal curve for the 99% confidence level.]<BR>\n" );
document.write( "=.1875 +-.1123<BR>\n" );
document.write( "=(.2998, .0752)  the 99% confidence interval of the true proportion of customers who order only cheese pizza. </SPAN>\n" );
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