document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=353114>Question 353114</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can you please tell me if i have done this correctly: 86% of all U.S. families had incomes below the poverty level.  Out of 400 randomly selected families whose householder had at least a Bachelores, 9 had incomes below the poverty level.  Do the data provide sufficient evidence to conclude that the percentage of families that earned incomes below the poverty level was lower among those whoe householders had at least a Bachelors than among all U.S. Families? Usa a = 0.01<BR>\n" );
document.write( "I did:<BR>\n" );
document.write( "9/400=0.0225<BR>\n" );
document.write( "z=0.0225-0.01/sqrt(0.01)(1-0.01)/400=0.022253, p = -0.4911<BR>\n" );
document.write( "Can you please tell me if I am correct?  Thank you for your help. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #252337 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=252337\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 86% of all U.S. families had incomes below the poverty level. <BR>\n" );
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document.write( "Comment: That seems like an outlandish statement.<BR>\n" );
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document.write( "Out of 400 randomly selected families whose householder had at least a Bachelores, 9 had incomes below the poverty level. Do the data provide sufficient evidence to conclude that the percentage of families that earned incomes below the poverty level was lower among those whoe householders had at least a Bachelors than among all U.S. Families? Usa a = 0.01<BR>\n" );
document.write( "I did:<BR>\n" );
document.write( "9/400=0.0225<BR>\n" );
document.write( "z=0.0225-0.01/sqrt(0.01)(1-0.01)/400=0.022253, p = -0.4911<BR>\n" );
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document.write( "Comment: You do not use 0.01 in that way.<BR>\n" );
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document.write( "Can you please tell me if I am correct?<BR>\n" );
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document.write( "Comment: If you can straighten out the percent of the general<BR>\n" );
document.write( "population below the poverty line, you may be able to get the<BR>\n" );
document.write( "correct answer.<BR>\n" );
document.write( "As it is you are comparing 86% to 2.25%.<BR>\n" );
document.write( "Hardly a close difference.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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document.write( "Ho: p = 0.86<BR>\n" );
document.write( "Ha: p < 0.86<BR>\n" );
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document.write( "p-hat = 9/400 =  </SPAN>\n" );
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