document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1129237>Question 1129237</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Construct a 95% confidence interval for the population mean, &#956;. Assume the population has a normal distribution. A sample of 20 college students had mean annual earnings of $3120 with a standard deviation of $677. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #745869 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=745869\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> t-test with df=19; t=2.093<BR>\n" );
document.write( "half-interval is t*s/sqrt(n)=+/-2.093*677/sqrt(20)=313.84<BR>\n" );
document.write( "($2806.16, $3433.84) </SPAN>\n" );
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