document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=293125>Question 293125</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hi, can anyone help me here. Can you show me the steps. Thanks in advance\r<BR>\n" );
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document.write( "A sample of 40 CDs from a student’s collection showed a mean length of 52.74 minutes with a standard deviation of 13.21 minutes. Construct a 95 percent confidence interval for the population standard deviation. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #211594 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=211594\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A sample of 40 CDs from a student’s collection showed a mean length of 52.74 minutes with a standard deviation of 13.21 minutes. Construct a 95 percent confidence interval for the population standard deviation.<BR>\n" );
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document.write( "Sample std = 13.21; Sample variance = 174.50<BR>\n" );
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document.write( "df=39<BR>\n" );
document.write( "lower Chi-Sq: 23.65 for df=39 and alpha/2 = 0.025<BR>\n" );
document.write( "upper Chi-Sq: 58.12 for df=39 and alpha/2 = 0.025<BR>\n" );
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document.write( "95% Confidence Interval:<BR>\n" );
document.write( "[(39)(174.50)]/58.12 < s^2 < [(39)(174.50)]/23.65<BR>\n" );
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document.write( "117.09 < s^2 < 287.76<BR>\n" );
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document.write( "10.82 < s < 16.96<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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