document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=478723>Question 478723</A>: <I><SPAN STYLE=\"word-break: break-all;\"> (8.62) In 1992, the FAA conducted 20,000 pre-employment drug tests on job applicants who were to be engaged in safety and security-related jobs, and found that 1000 were positive. \r<BR>\n" );
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document.write( "(a)	Construct a 95 percent confidence interval for the population proportion of positive drug tests. \r<BR>\n" );
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document.write( "(b) May you assume that this is a normal distribution? Explain why. (Check the normality of your proportion!)<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 #328039 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=328039\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> In 1992, the FAA conducted 20,000 pre-employment drug tests on job applicants who were to be engaged in safety and security-related jobs, and found that 1000 were positive. <BR>\n" );
document.write( "(a) Construct a 95 percent confidence interval for the population proportion <BR>\n" );
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document.write( "p-hat = 1/20 = 0.05<BR>\n" );
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document.write( "ME = 1.96*sqrt[0.05*0.95/20,000) = 0.003<BR>\n" );
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document.write( "95%CI: 0.05-0.003 < p < 0.05+0.003<BR>\n" );
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document.write( "0.047 < p < 0.053<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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