document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1168606>Question 1168606</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use the given information to find the number of degrees of​ freedom, the critical values X2/L and X2/R​, and the confidence interval estimate of o. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution.<BR>\n" );
document.write( "Nicotine in menthol cigarettes 90​% ​confidence; n=24​, s=0.21 mg.\r<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 #793332 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=793332\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> df=23<BR>\n" );
document.write( "the half-interval is t(0.95,df=23)*s/sqrt(n); t-value is 1.714<BR>\n" );
document.write( "=x bar +/-1,714*0.21/sqrt(24)<BR>\n" );
document.write( "=x bar +/-0.073\r<BR>\n" );
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