A new online education platform boasts that its students achieve significantly higher exam scores than students in traditional classroom settings. However, the platform's enrollment is entirely voluntary, and students must pass a rigorous entrance exam to be accepted. Which of the following, if true, most seriously undermines the platform's claim that its teaching methods are superior?
- AThe entrance exam for the online platform primarily assesses a student's prior knowledge and self-discipline.
- BMany students who apply to the online platform also apply to highly selective traditional universities.
- CTraditional classroom settings often have larger class sizes and less personalized instruction.
- DThe online platform's curriculum is constantly updated with the latest research and pedagogical approaches.
Show answer & explanationAnswer & explanation
Correct answer: A. The entrance exam for the online platform primarily assesses a student's prior knowledge and self-discipline.
The platform's claim of superior teaching methods is challenged if the observed success is due to the inherent qualities of the students, not the teaching. Option B indicates that the entrance exam selects for prior knowledge and self-discipline, suggesting that the students are already high-achievers who would likely succeed regardless of the teaching method, introducing a strong self-selection bias.
Why the other options are wrong
- B. This suggests that the students are generally high-achievers but doesn't directly undermine the claim about teaching methods.
- C. This comparison highlights a potential advantage of the online platform's methods, thus strengthening rather than undermining its claim.
- D. This supports the idea that the platform's methods are indeed superior, making it less likely to undermine the claim.
Self-Selection Bias
A bias that occurs when individuals select themselves into a group, causing the group to differ from the general population in ways that affect the outcome being studied.
- Individuals choose to participate or not.
- Can make groups appear different due to pre-existing characteristics.
- Challenges attributing outcomes solely to the intervention/program.
Memory trick: Is it the program, or who's in it?