STATE POLICE SET UP A ROADBLOCK TO ESTIMATE THE PERCENTAGE OF CARS WITH UP-TO-DA

Question

STATE POLICE SET UP A ROADBLOCK TO ESTIMATE THE PERCENTAGE OF CARS WITH UP-TO-DATE REGISTRATION, INSURANCE, AND SAFETY INSPECTION STICKERS. THEY USUALLY FIND PROBLEMS WITH ABOUT 10% OF THE CARS THEY STOP.

IN THIS PROBLEM, IDENTIFY (IF POSSIBLE) THE FOLLOWING:

•A. THE POPULATION

•B. THE POPULATION PARAMETER OF INTEREST

•C. THE SAMPLING FRAME

•D. THE SAMPLE

•E. THE SAMPLING METHOD, INCLUDING WHETHER OR NOT RANDOMIZATION WAS EMPLOYED

•F. ANY POTENTIAL SOURCES OF BIAS YOU CAN DETECT AND ANY PROBLEMS YOU SEE IN GENERALIZING TO THE POPULATION OF INTEREST.

Explanation / Answer

A. Cars

B. Are cars up to date

C. Select the car to check

D. Stopped cars

E. Convenience sampling

F. The cars that are not stopped might be having more problems

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