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Name: April 26, 2001 Score:

MATH 147

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Quiz 12

(10 pts.)

Problem 1. A simple random sample of 1000 households of a large population revealed the following information. Average number of motor vehicles owned per household is 1.8 with a standard deviation of 2.0. Average number of people under 30 per household is 3.4 people with a standard deviation of 2.2 people. Average number of motor vehicles per person under 30 is 0.6 motor vehicles with a standard deviation of 0.5 motor vehicles.

a. If possible, find a confidence interval for the average number of motor vehicles per household. If you can not, explain why.

b. If possible, find a confidence interval for the average number of motor vehicles per person under 30. If you can not, explain why.