document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=460435>Question 460435</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A doctor says that greater than 20% of US adults chew tobacco. In a random sample of 170 US adults, 15.5% say they chew tobacco. At alpha = .05, is there enough evidence to reject the doctor's claim?\r<BR>\n" );
document.write( "\n" );
document.write( "null: > or equal to .20<BR>\n" );
document.write( "alternative: < .20<BR>\n" );
document.write( "Left tailed test </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #315851 by </B><A HREF=/tutors/aboutme.mpl?userid=edjones><B>edjones(8007)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=edjones><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=edjones><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=315851\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> H[o]:>.20<BR>\n" );
document.write( "n=170, P=.155 Q=.845<BR>\n" );
document.write( "z=(.155-.200)/sqrt((.155*.845)/170)=-.045/.028=-1.62<BR>\n" );
document.write( "Since -1.62>-1.64 (the low bound of .05), we cannot reject the null hypothesis.<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Ed </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );