document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1159422>Question 1159422</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A sample of 20 elements produced a mean of 81.4 and a standard deviation of 10.44.<BR>\n" );
document.write( "Assuming the population has a normal distribution, construct a 90% confidence interval for<BR>\n" );
document.write( "the population mean. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #783132 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=783132\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> half-interval is t(0.95,df=19)*s/sqrt(n)<BR>\n" );
document.write( "=1.729*10.44/sqrt(20)<BR>\n" );
document.write( "=4.04<BR>\n" );
document.write( "90% CI is (77.36, 85.44) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );