According to ethical guidelines, psychological studies can never involve deception.

Question

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Deception may sometimes be necessary in psychological studies, but it must be justified and participants must be debriefed as soon as possible after the study is complete to inform them of any deception used. The ethical guidelines state that deception can only be used when it is justified by the study's significant prospective scientific, educational, or applied value, and when equally effective alternative procedures that do not involve deception are not feasible.

According to Ethical Guidelines, Psychological Studies Can Never Involve Deception