document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1160043>Question 1160043</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Based on interviews with 88 SARS​ patients, researchers found that the mean incubation period was 4.9 ​days, with a standard deviation of 15.7 days. Based on this​ information, construct a​ 95% confidence interval for the mean incubation period of the SARS virus. Interpret the interval. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #783321 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=783321\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 95% CI  half-interval  is t(0.975, df=87)*15.7/sqrt(88)<BR>\n" );
document.write( "t is 1.99<BR>\n" );
document.write( "CI half-interval is 3.33<BR>\n" );
document.write( "(1.57, 8.23) units days\r<BR>\n" );
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document.write( "We don't know what the exact mean is, and at any given point in time there is one. But we are 95% confident that the true mean lies in the interval. Stated another way, if we constructed 100 such intervals with the same sample size, we would expect the true mean to lie within 95 of them, but we wouldn't know which 95. </SPAN>\n" );
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