document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1168609>Question 1168609</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In a study of speed​ dating, male subjects were asked to rate the attractiveness of their female​ dates, and a sample of the results is listed below ​(1=not ​attractive; 10=extremely ​attractive). Construct a confidence interval using a 95​% confidence level. What do the results tell about the mean attractiveness ratings of the population of all adult​ females?<BR>\n" );
document.write( "5,9,2,9,7,4,6,8,8,9,4,8<BR>\n" );
document.write( "Need to find <BR>\n" );
document.write( "  < u < <BR>\n" );
document.write( "round to one decimal place 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 #793337 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=793337\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> mean is 6.58<BR>\n" );
document.write( "s=2.35<BR>\n" );
document.write( "95% T-half-interval is t(0.975,df=11)*s/sqrt(n)<BR>\n" );
document.write( "=2.201*2.35/sqrt(12)<BR>\n" );
document.write( "=1.49. Add to and subtract from x bar to get CI limits<BR>\n" );
document.write( "(5.1, 8.1). The true mean value is unknown and unknowable, but one can be 95% confident it lies in the interval shown. </SPAN>\n" );
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