document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=780109>Question 780109</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A medical researcher says that at least 23% of adults are smokers. In a random sample 250 adults, 22.4% say they are smokers. At alpha=0.03, is there enough evidence to the reject the researcher's claim? What is critical value of zo? What is the standardized test static? What would be the correct conclusion of the test? Fail to reject or reject?\r<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 #475477 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=475477\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A medical researcher says that at least 23% of adults are smokers. \r<BR>\n" );
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document.write( "Ho: p <= 0.23<BR>\n" );
document.write( "Ha: p > 0.23 (claim)<BR>\n" );
document.write( "p-hat = 0.224<BR>\n" );
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document.write( "In a random sample 250 adults, 22.4% say they are smokers.<BR>\n" );
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document.write( "What is the standardized test static? <BR>\n" );
document.write( "z(0.224) = (0.224-0.23)/sqrt(0.23*0.77/250) = -0.2254<BR>\n" );
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document.write( "At alpha=0.03, what is critical value of zo?<BR>\n" );
document.write( "invNorm(0.03) = -1.8808<BR>\n" );
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document.write( "At alpha=0.03, is there enough evidence to reject the researcher's claim?<BR>\n" );
document.write( "Ans: No<BR>\n" );
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document.write( "What would be the correct conclusion of the test? Fail to reject or reject?<BR>\n" );
document.write( "Fail to reject.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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