document.write( "Question 1177610: The yearly rates of traffic accidents and violations were studied for a group of 140 young
\n" ); document.write( "adult males who volunteered for treatment for substance abuse. For the five years
\n" ); document.write( "preceding treatment, their mean accident rate was 0.123 with a standard deviation of
\n" ); document.write( "0.167. At
\n" ); document.write( "  0.05
\n" ); document.write( "level of significance, test the claim that the sample differs from the
\n" ); document.write( "general driving population with a mean accident rate of
\n" ); document.write( " 
\n" ); document.write( "0.075. Find the p-value for
\n" ); document.write( "this test. \n" ); document.write( "

Algebra.Com's Answer #806748 by Boreal(15235) $\"\"$ $\"About$

You can put this solution on YOUR website!
Assuming a random sample, normal distribution and sd of sample being a reasonable estimator of pop sd
\n" ); document.write( "t-test
\n" ); document.write( "Ho: rate of accidents = 0.075
\n" ); document.write( "Ha: it isn't
\n" ); document.write( "alpha=0.05= p{reject Ho| Ho true}\r
\n" ); document.write( "\n" ); document.write( "this is a t-test with df=139, critical value 1.98
\n" ); document.write( "t=(0.123-0.075)/0.167/sqrt(140)
\n" ); document.write( "=0.048*sqrt(140)/0.167
\n" ); document.write( "=3.40
\n" ); document.write( "reject Ho p-value is 0.0009 \n" ); document.write( "

\n" );