document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1081181>Question 1081181</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An examination was applied to two groups of students, the first with 40 and the second with 50 students. In the first group, the mean score was 74 with a standard deviation of 8, while the latter had an average score of 78 and a standard deviation of 7. Is there a significant difference between the performance of the two classes at a level of Significance of 0.05? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #695351 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=695351\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> This is a two sample t-test<BR>\n" );
document.write( "t df=88, 0.975 = (x1bar-x2bar)/sp((1/n1^2)+(1/n2^2))<BR>\n" );
document.write( "This will give a t-test of -2.49 with a significance 0f 0.0149.<BR>\n" );
document.write( "Based on the 0.05 significance level, there is a significant difference.<BR>\n" );
document.write( "The formula is given there, a calculator for STAT TESTS  4, and fill in the information.\r<BR>\n" );
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