document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1026700>Question 1026700</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A random sample of 10 university students was surveyed to determine the amount of time spent weekly at the library. The times are: 13, 14, 5, 6, 8, 10, 7, 12, 15, and 3. If the times are normally distributed with a standard deviation of 5.2 hours, estimate with 90% confidence the mean weekly time at the library by all university students. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #642021 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=642021\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A random sample of 10 university students was surveyed to determine the amount of time spent weekly at the library. <BR>\n" );
document.write( "The times are: 13, 14, 5, 6, 8, 10, 7, 12, 15, and 3.<BR>\n" );
document.write( "Note:: The std of that sample is not 5.2, it is 4.33 <BR>\n" );
document.write( "If the times are normally distributed with a standard deviation of 5.2 hours, estimate with 90% confidence the mean weekly time at the library by all university students.<BR>\n" );
document.write( "x-bar = 9.44<BR>\n" );
document.write( "Me = 1.645*5.2/sqrt(10) = 2.7<BR>\n" );
document.write( "------<BR>\n" );
document.write( "90% CI:: 9.44-2.7 < u < 9.44+2.7<BR>\n" );
document.write( "---------------------------------------<BR>\n" );
document.write( "cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );