document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1045268>Question 1045268</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In a survey of 3107 &#8203;adults, 1499 say they have started paying bills online in the last year.\r<BR>\n" );
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document.write( "Construct a 99% confidence interval for the population proportion. &#8203;(Round to three decimal places as&#8203; needed.)\r<BR>\n" );
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document.write( "Interpret your results. Choose the correct answer below.<BR>\n" );
document.write( "A.With&#8203; 99% confidence, it can be said that the sample proportion of adults who say they have started paying bills online in the last year is between the endpoints of the given confidence interval.<BR>\n" );
document.write( "B.With&#8203; 99% confidence, it can be said that the population proportion of adults who say they have started paying bills online in the last year is between the endpoints of the given confidence interval.<BR>\n" );
document.write( "C.The endpoints of the given confidence interval show that adults pay bills online&#8203; 99% of the time. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #660772 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=660772\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> CI=phat +/- 2.576 sqrt{(p)(1-p)/n}<BR>\n" );
document.write( "1499/3107=0.482<BR>\n" );
document.write( "0.482+/-2.576*sqrt(0.482)(0.518)/3107; the SE is 0.00896, the interval itself (SE*2.576) is 0.023<BR>\n" );
document.write( "(0.459,0.505)<BR>\n" );
document.write( "The answer is B.  We are completely confident in what the sample says; we use confidence to describe what we think of the population. </SPAN>\n" );
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