Data Collectionmedium
0:00.0
A researcher randomly assigns 150 participants to either a new cognitive training program () or control (). Despite randomization, baseline measurements show:
- Training group: mean age = 52 years, 68% female
- Control group: mean age = 48 years, 45% female
After the training period, the training group shows significantly higher cognitive scores.
Which statement best describes a threat to internal validity?
A researcher randomly assigns 150 participants to either a new cognitive training program () or control (). Despite randomization, baseline measurements show:
- Training group: mean age = 52 years, 68% female
- Control group: mean age = 48 years, 45% female
After the training period, the training group shows significantly higher cognitive scores.
Which statement best describes a threat to internal validity?