document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1040401>Question 1040401</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?<BR>\n" );
document.write( "A. 0.115 < p < 0.260<BR>\n" );
document.write( "B. 0.086 < p < 0.289<BR>\n" );
document.write( "C. 0.075 < p < 0.300<BR>\n" );
document.write( "D. 0.102 < p < 0.273 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #655210 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=655210\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1 sample proportion<BR>\n" );
document.write( "p=15/80=0.1875<BR>\n" );
document.write( "CI interval +/- is z(0.995) sqrt{p(1-p)/n}<BR>\n" );
document.write( "2.576*sqrt{(0.1875)(0.8125)/80}; the second term is 0.0436<BR>\n" );
document.write( "multiplied by 2.576 is 0.1124<BR>\n" );
document.write( "CI is (0.0751,0.2999)<BR>\n" );
document.write( "It is C. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );