document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=881161>Question 881161</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Assume that the average age of students at a local community college is normally distributed. If a sample of size n=12 has a mean of 27.8 with a standard deviation of 4.1, find a 95 percent confidence interval.<BR>\n" );
document.write( " (Note: this is a t-CI) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #532008 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=532008\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Re TY<BR>\n" );
document.write( "E = t*s/sqrt(n) <BR>\n" );
document.write( "degree of freedom is 11, t = 2.201 at 95% confidence interval (Use table)<BR>\n" );
document.write( "ME = 2.20(4.1/sqrt(12))<BR>\n" );
document.write( "CI: 27.8-ME < u <  27.8 + ME </SPAN>\n" );
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