A researcher is interested in the effect of police on crime. She records the size of the police force and the crime rate of 100 communities selected using a quota sampling design. After analyzing the data obtained, she concludes that the size of the police force causes a decrease in the crime rate. This illustrates a(n) ______ approach to establishing causal relations.
A) random
B) experimental
C) longitudinal
D) nonexperimental
Correct Answer:
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