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Patrick was studying effects of small rewards (such as candy, gum, and soda pop) on intrinsic motivation. He tested fifth-grade children in a special room set aside by the school. Although he asked participants not to tell the students about the study, several children talked to their friends on the playground. Now some of his participants ask, "When will I get a candy bar?" when they arrive at the testing room. What is the problem?

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An example of diffusion of treatment is found and the details are presented.

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You are correct. The answer is (b) diffusion of treatment. You know this because here are the definitions of the other responses:

Self fulfilling prophecy - process by which one's expectations about a person eventually lead that person to ...

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