document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=141966>Question 141966</A>: <I><SPAN STYLE=\"word-break: break-all;\"> To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack<BR>\n" );
document.write( "kept track of the order in which papers were handed in. The first 25 papers showed a mean score of<BR>\n" );
document.write( "77.1 with a standard deviation of 19.6, while the last 24 papers handed in showed a mean score of<BR>\n" );
document.write( "69.3 with a standard deviation of 24.9. Is this a significant difference at &#945; = .05? (a) State the<BR>\n" );
document.write( "hypotheses for a right-tailed test. (b) Obtain a test statistic and p-value assuming equal variances.<BR>\n" );
document.write( "Interpret these results. (c) Is the difference in mean scores large enough to be important? (d) Is it reasonable<BR>\n" );
document.write( "to assume equal variances? (e) Carry out a formal test for equal variances at &#945; = .05, showing<BR>\n" );
document.write( "all steps clearly.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #103385 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=103385\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Answered previously.<BR>\n" );
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document.write( "----------------------------------<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );