document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=761800>Question 761800</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A random sample of medical files is used to estimate the proportion of all people that have blood type B blood. If you have no preliminary estimate for p how many medical files should you include in order to be 95% sure the point estimate will be within a distance of .030 from p </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #463476 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=463476\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A random sample of medical files is used to estimate the proportion of all people that have blood type B blood. If you have no preliminary estimate for p how many medical files should you include in order to be 95% sure the point estimate will be within a distance of .030 from p<BR>\n" );
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document.write( "n = [z/E]^2*pq<BR>\n" );
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document.write( "n = [1.96/0.03]^2*(1/2)^2 = 1068 when rounded up<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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document.write( " </SPAN>\n" );
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