document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1100566>Question 1100566</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In 2009, a consulting firm surveyed a random sample of 700 U.S. businesses and found that 28% of them were owned by women. \r<BR>\n" );
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document.write( "Create a 90% confidence interval for the true proportion of U.S. businesses that are owned by women.<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 #715070 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=715070\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  In 2009, a consulting firm surveyed a random sample of 700 U.S. businesses and found that 28% of them were owned by women. <BR>\n" );
document.write( "Create a 90% confidence interval for the true proportion of U.S. businesses that are owned by women.<BR>\n" );
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document.write( "sample proportion:: 0.28<BR>\n" );
document.write( "ME = z*sqrt(pq/n) = 1.645*sqrt[0.28*0.72/700) = 0.0279<BR>\n" );
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document.write( "90% CI: 0.28-0.0279 < p < 0.28+0.0279<BR>\n" );
document.write( "90% CI: 0.2521 < p < 0.3079<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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