document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=320860>Question 320860</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Need instructions of how they get the answer...\r<BR>\n" );
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document.write( "A doctor believes that the standard deviation of systolic blood pressure is 450.  A random sample of 24 patients found a standard deviation of 520.  Assume the variable is normally distributed and a=0.01.  What are the critical value?\r<BR>\n" );
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document.write( "What formula / steps should be used on this...since there are two standard deviaitons... </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #229834 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=229834\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A doctor believes that the standard deviation of systolic blood pressure is 450.<BR>\n" );
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document.write( "A random sample of 24 patients found a standard deviation of 520. <BR>\n" );
document.write( "Assume the variable is normally distributed and a=0.01. <BR>\n" );
document.write( "What is the critical value? \r<BR>\n" );
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document.write( "The problem statement implies you will do an F-test.<BR>\n" );
document.write( "You need to look at an F-distribution Table and find <BR>\n" );
document.write( "the F value with a right tail of 1% with the proper<BR>\n" );
document.write( "degrees of freedom.<BR>\n" );
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document.write( "F= larger variance/smaller variance = 520/450<BR>\n" );
document.write( "df for numerator: 23<BR>\n" );
document.write( "df for denominator: infinity<BR>\n" );
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document.write( "Ans: F-value for right-tail of 1% = 1.6402<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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