document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=894905>Question 894905</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The length of stay for patients in some 20 hospitals was 3.8 days with a standard deviation of 1.2 days. Can you determine the confidence interval for the length of stay?\r<BR>\n" );
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document.write( "a=0.1 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #542483 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=542483\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The length of stay for patients in some 20 hospitals was 3.8 days with a standard deviation of 1.2 days. Can you determine the confidence interval for the length of stay?<BR>\n" );
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document.write( "x-bar = 3.8<BR>\n" );
document.write( "ME = z*s/sqrt(n) = 2.5758*1.2/sqrt(20) = 0.6912<BR>\n" );
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document.write( "99% CI:: 3.8-0.6912 < u < 3.8+0.6912<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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