document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=596022>Question 596022</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Using two independent samples, we test for a hypothesized difference between two population means. The population standard deviations are equal. The number in the first sample is fifteen and the number in the second sample is twelve. How many degrees of freedom are associated with the critical value?\r<BR>\n" );
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document.write( "a.24<BR>\n" );
document.write( "b.25<BR>\n" );
document.write( "c.26<BR>\n" );
document.write( "d.27 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #377434 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=377434\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Degrees of freedom:\r<BR>\n" );
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document.write( "df = n1 + n2 - 2\r<BR>\n" );
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document.write( "df = 15 + 12 - 2\r<BR>\n" );
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document.write( "df = 27 - 2\r<BR>\n" );
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document.write( "df = 25\r<BR>\n" );
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document.write( "So the answer is choice B\r<BR>\n" );
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document.write( "Note: the formula only works if the population standard deviations are equal </SPAN>\n" );
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