document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1176130>Question 1176130</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A research group states that 16% of the firms of type A increased their market research budgets in the past five year for type B firms , the figure was 9% What are the mean and standard deviation of the sampling distribution of the difference between sample proportion, based on independent random samples of 100 firms of each type? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #802423 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=802423\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The mean of the difference is 0.16-0.09=0.07<BR>\n" );
document.write( "the SE is sqrt(0.125*0.875)(1/100+1/100)<BR>\n" );
document.write( "This is 0.0468<BR>\n" );
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