document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=139126>Question 139126</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In 1992, the FAA conducted 86,991 pre-employment drug tests on job applicants who were to be<BR>\n" );
document.write( "engaged in safety and security-related jobs, and found that 1,143 were positive. (a) Construct a<BR>\n" );
document.write( "95 percent confidence interval for the population proportion of positive drug tests. (b) Why is the<BR>\n" );
document.write( "normality assumption not a problem, despite the very small value of p? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #101582 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=101582\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a) I ran a 1-PropZInt test on a TI calculator to get the following interval<BR>\n" );
document.write( "0.01238 < p < 0.0139<BR>\n" );
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document.write( "b) While p is small, the population is very large so np and nq<BR>\n" );
document.write( "> 5 is a  reasonable assumption.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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