Which of the following types of samples is almost always biased?
A. Simple random samples.
B. Stratified random samples.
C. Cluster samples.
D. Self-selected samples.
Analysis:
A. Incorrect. Self-selected samples is almost always biased.
B. Incorrect. Self-selected samples is almost always biased.
C. Incorrect. Self-selected samples is almost always biased.
D. Correct. Self-selected samples is almost always biased.
ANSWER : D
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