Gemma designs a weight loss intervention for obese individuals living in assisted living homes who are at risk of diabetes and stroke. Individuals in this intervention are provided a personal trainer (3 times per week) and professionally prepared low-calorie meals with organic fruits, vegetables, low-fat meats. After 16 weeks, the intervention group loses twice as much weight as the wait-list control group. What threat to validity is the MOST problematic in generalizing the findings to independent living obese adults at risk of diabetes and stroke? Compensatory/resentful demoralization Cross-contamination Interaction of selection and treatment Interaction of setting and treatment Interaction of history and treatment

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Gemma designs a weight loss intervention for obese individuals living in assisted living homes who are at risk of diabetes and stroke. Individuals in this intervention are provided a personal trainer (3 times per week) and professionally prepared low-calorie meals with organic fruits, vegetables, low-fat meats. After 16 weeks, the intervention group loses twice as much weight as the wait-list control group.

What threat to validity is the MOST problematic in generalizing the findings to independent living obese adults at risk of diabetes and stroke?

  1. Compensatory/resentful demoralization
  2. Cross-contamination
  3. Interaction of selection and treatment
  4. Interaction of setting and treatment
  5. Interaction of history and treatment
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