In 1969, social psychologist Allan Wicker completed a review of dozens of research studies and concluded that people's expressed attitudes predicted their varying behaviors.

Hardly ever

Explanation:

Expressed attitudes refers to the attitudes that people show when they're in public.  Wicker found that expressed attitudes tend to be designed / catered by people in order to be accepted by the social group. So often times, expressed behaviors can't really used to predict's people behaviors.

Most people can only truly understand other people's behaviors by being close to them until they are comfortable enough to act without any pretense.

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