Data Collectionmedium
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A researcher studies the effect of a self-monitoring app on exercise behavior. Participants are randomly assigned to:
- Group A: Use a self-monitoring app tracking daily step count with visible display
- Group B: Continue normal behavior (control)
After 8 weeks, Group A shows 45% increase in steps while Group B shows 3% increase. However, qualitative interviews reveal Group A participants increased steps partly because they were motivated to 'look good' on the app's display.
Which statement best explains a potential threat to validity in concluding the app is effective?
A researcher studies the effect of a self-monitoring app on exercise behavior. Participants are randomly assigned to:
- Group A: Use a self-monitoring app tracking daily step count with visible display
- Group B: Continue normal behavior (control)
After 8 weeks, Group A shows 45% increase in steps while Group B shows 3% increase. However, qualitative interviews reveal Group A participants increased steps partly because they were motivated to 'look good' on the app's display.
Which statement best explains a potential threat to validity in concluding the app is effective?