document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=872469>Question 872469</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 11.	The monthly incomes for 12 randomly selected people, each with a bachelor’s degree in economics, are shown below.<BR>\n" );
document.write( "Assume the population is normally distributed.<BR>\n" );
document.write( "4450.36     4596.43     4366.26<BR>\n" );
document.write( "4455.52     4151.31     4407.46<BR>\n" );
document.write( "4283.11     4527.74     4407.46<BR>\n" );
document.write( "3946.48     4023.48     4221.98<BR>\n" );
document.write( "a.	Find the sample mean.<BR>\n" );
document.write( "b.	Find the sample standard deviation.<BR>\n" );
document.write( "c.	Construct a 99% confidence interval for the population mean &#956;.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #526179 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=526179\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  <PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\"><font face = \"consolas\" color = \"indigo\" size = 3><b><BR>\n" );
document.write( "Hi<BR>\n" );
document.write( "a) mean = 4319.80<BR>\n" );
document.write( "b) SD = 199.83 (Using (n-1)<BR>\n" );
document.write( "ME(99% Confidence Interval, df = 11) = 3.106*199.83/sqrt(12)<BR>\n" );
document.write( "CI: CI: 4319.80 -ME < u <  4319.80 + ME </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );