document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=864799>Question 864799</A>: <I><SPAN STYLE=\"word-break: break-all;\"> At a university, the average cost of books per student has been $600 per student per semester. The Dean of Students believes that the costs are increasing and that the average is now greater than $600.  He surveys a sample of 40 students and finds that for the most recent semester their average cost was $645 with a standard deviation of $75.  What is the test value for this hypothesis test? \r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #521290 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=521290\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> At a university, the average cost of books per student has been $600 per student per semester. The Dean of Students believes that the costs are increasing and that the average is now greater than $600. He surveys a sample of 40 students and finds that for the most recent semester their average cost was $645 with a standard deviation of $75. What is the test value for this hypothesis test? <BR>\n" );
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document.write( "Ho: u <= 600<BR>\n" );
document.write( "Ha: u > 600 (claim)<BR>\n" );
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document.write( "test stat:: t(645) = (645-600)/[75/sqrt(40)] = 3.79<BR>\n" );
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document.write( "Note:: If you use a z-test <BR>\n" );
document.write( "test stat = 45/75 = 0.6<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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