document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=981815>Question 981815</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In 1993&#8203;, one county reported that among 3108 white women who had&#8203; babies, <BR>\n" );
document.write( " 139 were multiple births. There were also 15 multiple births to <BR>\n" );
document.write( " 626 black women. Does this indicate any racial difference in the likelihood of multiple&#8203; births? <BR>\n" );
document.write( " What is the test statistic (z)? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #602761 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=602761\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> This is a two sample proportion test<BR>\n" );
document.write( "Ho=proportions equal<BR>\n" );
document.write( "Ha=proportions not equal.<BR>\n" );
document.write( "alpha=0.05 <BR>\n" );
document.write( "test statistic;;  z= [(phat1-phat2)-(p1-p2)]/sqrt{ ((p1)*(1-p1)/n1))+ ((p2)(1-p2))/n2)}<BR>\n" );
document.write( "Critical value abs(z)>1.96<BR>\n" );
document.write( "on the calculator<BR>\n" );
document.write( "phat1=0.0447; p2hat=0.0234<BR>\n" );
document.write( "z=2.38<BR>\n" );
document.write( "Reject Ho; there is a difference.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );