motor vehicle department

# motor vehicle department - Data from the Motor Vehicle...

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Data from the Motor Vehicle Department indicate that 80% of all licensed drivers are older than age 25. a. In a sample of n=60 people who recently received speeding tickets, 38 were older than 25 years and the other 22 were age 25 or younger. Is the age distribution for this sample significantly different from the distribution for the population of licensed drivers? Use a = .05. Assumptions: The 2 categories we are comparing are: Licensed drivers age 25 or younger, and licensed drivers over age 25. Multiplying each of the expected proportions from the null hypothesis below by the sample size of 60, we find that the expected counts are 12, and 48 respectively. Because each expected count is at least 5, we can use the Goodness of Fit test. Using the P -value Method 1. The claim is that the proportion of ages from this sample differ from 25 0.20 p , 25 0.80 p as reported by the DMV. The correct hypothesis is, 0 25 25 1 : 0.20 0.80 : ( ) H p and p H At least one proportion differs from above claim This is a right-tailed test.

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