A teacher believes that one group of children is very bright and the second group is below average i….

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A teacher believes that one group of children is very bright and the second group is below average in ability. Actually, the groups are identical but the first group progresses more rapidly than the second. This demonstrates

Options :-

1. the self-fulfilling prophecy
2. the placebo effect in a natural experiment
3. observer bias in naturalistic observation
4. the ethical problems of field experiments

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