document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=741964>Question 741964</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An economics professor randomly selected 25 millionaires in the United States.  The average age of these millionaires was 54.8 years with a sample standard deviation of 7.9 years.  What is the 99% confidence interval for the mean age, µ, of all United States millionaires?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #452217 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=452217\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> An economics professor randomly selected 25 millionaires in the United States. The average age of these millionaires was 54.8 years with a sample standard deviation of 7.9 years. What is the 99% confidence interval for the mean age, µ, of all United States millionaires? <BR>\n" );
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document.write( "x-bar = 54.8<BR>\n" );
document.write( "ME = 2.5758*7.9/sqrt(25) = 4.070<BR>\n" );
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document.write( "99% CI: 54.8-4.070 < u < 54.8+4.070<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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