document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=144762>Question 144762</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1.         A study conducted by Ariel Mutual Funds and Charles Schwab Corporation surveyed 500 African American with an annual income above $50,000 and 500 white Americans with an annual income above $50,000.  The results indicated that 74% of the African Americans and 84% of the whites owned stocks (Cheryl Winokur Munk, “Stock-Ownership Race Gap Shrinks,”.  “The Wall Street Journal, June 13, 2002, B11).  Is there a difference between the proportion of African American with an annual income above $50,000 who invest in stocks and the proportion of whites with income an annual income above $50,000 who invest in stocks at a 95% level of confidence?\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 #105548 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=105548\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Schwab Corporation surveyed 500 African American with an annual income above $50,000 and 500 white Americans with an annual income above $50,000. The results indicated that 74% of the African Americans and 84% of the whites owned stocks (Cheryl Winokur Munk, “Stock-Ownership Race Gap Shrinks,”. “The Wall Street Journal, June 13, 2002, B11). Is there a difference between the proportion of African American with an annual income above $50,000 who invest in stocks and the proportion of whites with income an annual income above $50,000 who invest in stocks at a 95% level of confidence? <BR>\n" );
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document.write( "Ho: u(white) - u(black) = 0<BR>\n" );
document.write( "Ha: u(w) - u(b) is not zero<BR>\n" );
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document.write( "I ran a 2-PropZTest on a TI calculator and got the following:<BR>\n" );
document.write( "test statistic: z = 3.8819...<BR>\n" );
document.write( "p-value: 2P(3.8819.. < z < 10) = 0.00010367..<BR>\n" );
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document.write( "Conclusion: Since p-value is less than 5%, reject Ho.<BR>\n" );
document.write( "There is a difference between ...etc.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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