document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=754302>Question 754302</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A screening program tests people for hookworm infection, and treats them if they are found to be infected. A diagnosis of hookworm infection is made when a hookworm egg is identified by microscopy in a stool specimen, usually involving multiple slides(sample from the stool specimen). The sensitivity of the stool exam is 75% per slide i.e. if a person is infected, there is a 75% chance that the microscopist will identify an egg on a single slide from the stool specimen. How many slides will need to be taken from a given stool specimen to ensure that an infected person will have a probability of at least 99% of receiving treatment? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #458957 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=458957\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A screening program tests people for hookworm infection, and treats them if they are found to be infected. A diagnosis of hookworm infection is made when a hookworm egg is identified by microscopy in a stool specimen, usually involving multiple slides(sample from the stool specimen). The sensitivity of the stool exam is 75% per slide i.e. if a person is infected, there is a 75% chance that the microscopist will identify an egg on a single slide from the stool specimen. How many slides will need to be taken from a given stool specimen to ensure that an infected person will have a probability of at least 99% of receiving treatment?<BR>\n" );
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document.write( "n = [z/E]^2*pq<BR>\n" );
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document.write( "n = [2.5758/0.01]^2*0.75*0.25 = 12441<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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