document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=287483>Question 287483</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The football coach randomly selected 10 players and timed how long each player took to perform a certain drill.  The time (in minutes) were<BR>\n" );
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document.write( "6  10  7  9 12<BR>\n" );
document.write( "8  10  9  7 5 \r<BR>\n" );
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document.write( "Find a 95% confidence interval for the population standard deviation\r<BR>\n" );
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document.write( "  I think<BR>\n" );
document.write( "n = 10 <BR>\n" );
document.write( "x (bar) = 8.3<BR>\n" );
document.write( "E x(bar) = 83<BR>\n" );
document.write( "E x2 = 729<BR>\n" );
document.write( "s = 2.1108    HOWEVER I don't know how to get \"s\" on a normal non graphing calculator    the \"s\" answer was shown/given to me.  Which is useless for my test tomorrow.   Thank you for any/all help </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #208359 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=208359\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> consider an infinite population with a mean of 160 and standard deviation of 25,a random sample size of 64 is taken from this population. the standard deviation of the sample mean equals?<BR>\n" );
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document.write( "Finding standard deviation can be done with paper and pencil (or with<BR>\n" );
document.write( "a calculator with no stat functions) but is a laborious process.<BR>\n" );
document.write( "1. Find the mean of the sameple (u)<BR>\n" );
document.write( "2. Find the difference between each sample and the mean (x-u)<BR>\n" );
document.write( "3. Square all those differences and all the square values .<BR>\n" );
document.write( "4. Divide by the number of sample elements<BR>\n" );
document.write( "5. The standard deviation is the square root of the number in step 4.<BR>\n" );
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document.write( "Note: There are many on-line sites that will give you the <BR>\n" );
document.write( "standard deviation for a given set of data.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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