document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=249571>Question 249571</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 16.The use of cellular phones in automobiles has increased dramatically in the last few years. Of concern to traffic experts, as well as manufacturers of cellular phones, is the effect on accident rates. Is someone who is using a cellular phone more likely to be involved in a traffic accident? What is your conclusion from the following sample information? Use the .05 significance level.\r<BR>\n" );
document.write( "\n" );
document.write( "Â / Had Accident in the Last Year / Did Not Have an Accident in the Last Year<BR>\n" );
document.write( "Uses a cell phone / 25 / 300<BR>\n" );
document.write( "Does not use a cell phone / 50 / 400<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #181773 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=181773\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The use of cellular phones in automobiles has increased dramatically in the last few years. Of concern to traffic experts, as well as manufacturers of cellular phones, is the effect on accident rates. Is someone who is using a cellular phone more likely to be involved in a traffic accident? What is your conclusion from the following sample information? Use the .05 significance level. <BR>\n" );
document.write( "Â / Had Accident in the Last Year / Did Not Have an Accident in the Last Year<BR>\n" );
document.write( "Uses a cell phone / 25 / 300<BR>\n" );
document.write( "Does not use a cell phone / 50 / 400<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "Ho: The row and column factors are independent<BR>\n" );
document.write( "H1: They are dependent<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "I ran a Chi-Sq test on the 2 by 2 data set and got the following:<BR>\n" );
document.write( "test stat: Chi-sq = 2.5234<BR>\n" );
document.write( "p-value: 0.1122<BR>\n" );
document.write( "df = (2-1)(2-1) = 1<BR>\n" );
document.write( "========================<BR>\n" );
document.write( "Conclusion: Since the p-value is grater than 5%, <BR>\n" );
document.write( "do not reject Ho; the row and column factors are independent.<BR>\n" );
document.write( "=================================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );