document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=472922>Question 472922</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1) A recent study of 750 internet users in Europe found that 260 of internet users were women.  What is the 95% confidence interval of the true proportion of women in Europe who use the internet?\r<BR>\n" );
document.write( "\n" );
document.write( "2)  A survey of 800 women shoppers found that 17% of them shop on impulse.  What is the 98& confidence interval for the true proportion of women shhoppers who shop on impulse? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #324264 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=324264\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> n=750, p=260/750=.347, q=.653<BR>\n" );
document.write( "(a,b)=p+z[alpha/2]*sqrt((p*q)/n)<BR>\n" );
document.write( "=.347+-(1.96)*sqrt((.347*.653)/750) Z for the 95% confidence level is 1.96<BR>\n" );
document.write( "=.347+-(1.96)(.0174)<BR>\n" );
document.write( "=.347+-.034<BR>\n" );
document.write( "=(.381, .313)<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Ed<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );