document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1161734>Question 1161734</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In a test of the effectiveness of garlic for lowering​ cholesterol, 49 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes ​(beforeminus​after) in their levels of LDL cholesterol​ (in mg/dL) have a mean of 5.4 and a standard deviation of 16.4. Construct a 95​% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDL​ cholesterol? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #785766 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=785766\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The 95% CI half interval is t (0.975, df=48)*s/sqrt (n)<BR>\n" );
document.write( "t=2.01<BR>\n" );
document.write( "half-interval is 2.01*16.4/7=4.71<BR>\n" );
document.write( "add to and subtract from mean<BR>\n" );
document.write( "(0.69, 10.11) mg % are units<BR>\n" );
document.write( "The CI suggests that there is a positive change since 0 is not in the confidence interval. It would suggest that garlic does help reduce LDL. </SPAN>\n" );
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