document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1143836>Question 1143836</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Construct a 99 ​% confidence interval about u1 - u2. \r<BR>\n" );
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document.write( "Population 1: n = 19, x = 17, s = 4.8<BR>\n" );
document.write( "Population 2: n = 19, x = 21.2, s = 3.6\r<BR>\n" );
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document.write( "We are 99​% confident that the mean difference is between ... and ...<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #764826 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=764826\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> t with df=36 (19+19-2), t=2.7195, difference in means is -4.2<BR>\n" );
document.write( "s^2=sqrt((s1^2/19)+(s2^2/19))=1.89<BR>\n" );
document.write( "s=1.38<BR>\n" );
document.write( "99%CI half-interval is 2.72*1.38=3.75<BR>\n" );
document.write( "CI=(-7.95, -0.45)\r<BR>\n" );
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