Dr. John, in his study investigating the effect of stress on consumption of carbohydrates, found that stress increased the consumption of carbohydrates. However, he also found that stress increased the desire to consume carbohydrates, the amount of time a person thought about carbohydrates, and the amount of time a person thought about eating. Because stress had the same affect on these other measures that were related to consumption of carbohydrates, the study had

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Outcome validity refers to the extent to which a study's results accurately reflect the true effects of the independent variable on the dependent variable. In this case, the study found that stress increased the consumption of carbohydrates, as well as the desire to consume carbohydrates, the amount of time a person thought about carbohydrates, and the amount of time a person thought about eating. These other measures are all related to consumption of carbohydrates, so the fact that stress had the same effect on them suggests that the study has outcome validity.

Dr John, in His Study Investigating the Effect of Stress