document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1076063>Question 1076063</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Construct a 95% confidence interval for the mean age at which a baby first crawls. Select the correct choice and, if necessary, fill in the answer boxes to complete your choice.<BR>\n" );
document.write( " The numbers are: 52, 30, 44, 35, 47, 37, 56, 26, 52, 39, 44, 47\r<BR>\n" );
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document.write( "I know the mean is 42.42, standard deviation is 9.22, and normal probability plot correlation is 9.22. I just am having a hard time getting the right answer.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #690829 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=690829\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The confidence interval for a sample is mean +/-t(df=11,0.975)s/sqrt(n); t=2.201<BR>\n" );
document.write( "The interval is +/-2.201*9.22/sqrt(12)=5.86<BR>\n" );
document.write( "The 95% CI is (36.6, 48.3) </SPAN>\n" );
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