A researcher wants to determine what percentage of the population in the southeastern United States would use a mass transit system if it were well-maintained. He gets telephone books from every city with over 200,000 people in those states and selects the fifteenth name in the middle column on every hundredth page as his sample. He has made a _____ error.
A. targeting
B. random
C. nonprobability
D. frame
E. reliability
Answer: D
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