document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1169423>Question 1169423</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Listed below are speeds​ (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at​ 3:30 P.M. on a weekday. Use the sample data to construct a 95​% confidence interval estimate of the population standard deviation.<BR>\n" );
document.write( "62<BR>\n" );
document.write( "60<BR>\n" );
document.write( "60<BR>\n" );
document.write( "57<BR>\n" );
document.write( "60<BR>\n" );
document.write( "52<BR>\n" );
document.write( "59<BR>\n" );
document.write( "58<BR>\n" );
document.write( "59<BR>\n" );
document.write( "68<BR>\n" );
document.write( "58<BR>\n" );
document.write( "67\r<BR>\n" );
document.write( "\n" );
document.write( "The confidence interval estimate is nothing ​mi/h<σ< ​mi/h. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #794214 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=794214\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> mean is 60 mi/hr<BR>\n" );
document.write( "sd is 4.26 mi/hr<BR>\n" );
document.write( "t(0.975, df=11)=2.201<BR>\n" );
document.write( "95% half-interval is 2.201*4.26/sqrt(12)=2.71<BR>\n" );
document.write( "interval then is (57.29, 62.71) units mi/hr. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );