document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1159792>Question 1159792</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A corporation that maintains a large fleet of company cars for the use of its sales staff is interested in the mean distance driven monthly per sales person. The following table gives the monthly distances in miles driven by a random sample of 16 sales persons:<BR>\n" );
document.write( "2415, 2221, 2481, 2618, 2660, 1967, 2260, 1938, 2410, 2062, 2466, 2484, 2603, 1994, 2328, 1861<BR>\n" );
document.write( "Based on this sample, find a 90% confidence interval for the mean number of miles driven monthly by members of the sales staff, assuming that monthly driving distances are normally distributed.<BR>\n" );
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document.write( "Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.)\r<BR>\n" );
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document.write( "What is the lower limit of the 90% confidence interval?	<BR>\n" );
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document.write( "What is the upper limit of the 90% confidence interval?	 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #782871 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=782871\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> mean is 2298<BR>\n" );
document.write( "sd is 262.75<BR>\n" );
document.write( "half-interval is t(0.95df=15)*s/sqrt(n)<BR>\n" );
document.write( "=1.753*262.75/4<BR>\n" );
document.write( "=115.15\r<BR>\n" );
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document.write( "the 90%CI is (2182.85, 2413.15) units miles </SPAN>\n" );
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