Exhibit 12-6
The owner of a car wash wants to see if the arrival rate of cars follows a Poisson distribution. In order to test the assumption of a Poisson distribution, a random sample of 150 ten-minute intervals was taken. You are given the following observed frequencies:
-Refer to Exhibit 12-6. At 95% confidence, the conclusion of the test is that the
A)arrival of cars follows a Poisson distribution
B)arrival of cars does not follow a Poisson distribution
C)test is inconclusive
D)None of these alternatives is correct.

Question

Exhibit 12-6
The owner of a car wash wants to see if the arrival rate of cars follows a Poisson distribution. In order to test the assumption of a Poisson distribution, a random sample of 150 ten-minute intervals was taken. You are given the following observed frequencies: 
-Refer to Exhibit 12-6. At 95% confidence, the conclusion of the test is that the
A)arrival of cars follows a Poisson distribution 
B)arrival of cars does not follow a Poisson distribution 
C)test is inconclusive 
D)None of these alternatives is correct.

Quizplus · Accepted Answer

The p-value is 0.098, which is greater than 0.05. Therefore, we fail to reject the null hypothesis and conclude that the arrival of cars follows a Poisson distribution.

Exhibit 12-6 The Owner of a Car Wash Wants to See If