Question 1177610: The yearly rates of traffic accidents and violations were studied for a group of 140 young
adult males who volunteered for treatment for substance abuse. For the five years
preceding treatment, their mean accident rate was 0.123 with a standard deviation of
0.167. At
0.05
level of significance, test the claim that the sample differs from the
general driving population with a mean accident rate of
0.075. Find the p-value for
this test.
Answer by Boreal(15235)   (Show Source):
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
t-test
Ho: rate of accidents = 0.075
Ha: it isn't
alpha=0.05= p{reject Ho| Ho true}
this is a t-test with df=139, critical value 1.98
t=(0.123-0.075)/0.167/sqrt(140)
=0.048*sqrt(140)/0.167
=3.40
reject Ho p-value is 0.0009
|
|
|
