A researcher is interested in the impact of a new morality education program on children's aggression. To test the effectiveness of the program, the researcher chooses a group of elementary school children who have had problems with aggression. Each week for 6 months, the participating children spend an hour with a school psychologist who teaches them the morality program. At the beginning and at the end of the 6 months, their classroom teachers rate each child's level of aggression. The researcher determines that the training program has been effective, as there has been a decrease in aggression following the program. Describe three potential sources of invalidity.

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The Answer of A researcher is interested in the impact of a new morality education program on children's aggression. To test the effectiveness of the program, the researcher chooses a group of elementary school children who have had problems with aggression. Each week for 6 months, the participating children spend an hour with a school psychologist who teaches them the morality program. At the beginning and at the end of the 6 months, their classroom teachers rate each child's level of aggression. The researcher determines that the training program has been effective, as there has been a decrease in aggression following the program. Describe three potential sources of invalidity.

A Researcher Is Interested in the Impact of a New