document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1018815>Question 1018815</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A drug company is developing a new pregnancy-test kit for use on an outpatient basis. The company uses the pregnancy test on 100 women who are known to be pregnant, for whom 96 test results are positive. The company uses the pregnancy test on 100 other women who are known to not be pregnant, of whom 99 test negative.\r<BR>\n" );
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document.write( "a) Calculate the sensitivity, specificity and predictive positive value of the test. Write the formula and show your work.<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 #634832 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=634832\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> ====T+===T-===Total<BR>\n" );
document.write( "P+==96===4=== 100 pregnant<BR>\n" );
document.write( "P-== 1===99===100 not pregnant<BR>\n" );
document.write( "T===97==103===200<BR>\n" );
document.write( "Sensitivity is proportion of people pregnant who are correctly diagnosed.<BR>\n" );
document.write( "P(T+|P+), given that they are pregnant, what is the probability they test positive.<BR>\n" );
document.write( "Specificity is proportion of people not pregnant who are correctly diagnosed. Given that they are not pregnant, what is the probability they test negative <BR>\n" );
document.write( "P(T-|P-)<BR>\n" );
document.write( "Positive predictive value of the test is sum of true positives/TP+FP.<BR>\n" );
document.write( "(96/97). </SPAN>\n" );
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