document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1043438>Question 1043438</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The table shows the results of a survey in which separate samples of 400 adults each from the&#8203; East, South,&#8203; Midwest, and West were asked if traffic congestion is a serious problem in their community. Complete part&#8203; (a)\r<BR>\n" );
document.write( "\n" );
document.write( "East      36%<BR>\n" );
document.write( "South     33%<BR>\n" );
document.write( "Midwest   25%<BR>\n" );
document.write( "West      55%\r<BR>\n" );
document.write( "\n" );
document.write( " <BR>\n" );
document.write( "&#8203;(a) Construct a&#8203; 95% confidence interval for the proportion of adults from the East who say traffic congestion is a serious problem.\r<BR>\n" );
document.write( "\n" );
document.write( "The&#8203; 95% confidence interval for the proportion of adults from the East who say traffic congestion is a serious problem is? Round to three decimal places as needed. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #658572 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=658572\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> CI interval for 95% is z*sqrt{ (p)*(1-p)/n}<BR>\n" );
document.write( "That is 1.96*sqrt {(0.36)(0.64)/400}<BR>\n" );
document.write( "'That is 1.96 sqrt (0.000576)=1.96*0.024=0.047<BR>\n" );
document.write( "The interval is 0.36+/-0.047, or (0.313,0.407) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );