document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=972972>Question 972972</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The average weight of 40 randomly selected minivans was 4150 pounds with a standard deviation of 480. Find a point estimate of the population mean. Find the 99% confidence interval of the true mean weight of the minivans. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #595238 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=595238\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Point estimate is the sample mean, which is 4150 pounds.  It is the best \"guess\" one has.<BR>\n" );
document.write( "z.99=2.58<BR>\n" );
document.write( "99% CI =+/-2.58 *SE of the mean.\r<BR>\n" );
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document.write( "SE= 480/sqrt (40)   ;;It is the standard deviation/sqrt (sample size)\r<BR>\n" );
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document.write( "75.894 is SE<BR>\n" );
document.write( "To the nearest pound, z*SE=+/-196\r<BR>\n" );
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document.write( "CI = (3954,4346) units are pounds\r<BR>\n" );
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document.write( " </SPAN>\n" );
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