GMAT Focus EditionVerbal ReasoningMedium
A new online platform for learning foreign languages claims its method is superior because it uses an adaptive algorithm that customizes lessons based on individual student progress, unlike traditional static textbooks. A recent internal study by the platform showed that students using their algorithm achieved fluency faster than students learning with textbooks. Which of the following, if true, would most strengthen the platform's claim regarding the superiority of its adaptive algorithm?
- AFluency was measured using a standardized test that is widely recognized as reliable and valid.
- BStudents in the study using textbooks also had access to online dictionaries and translation tools.
- CThe platform's adaptive algorithm incorporates gamification elements that boost student motivation.
- DThe study controlled for the prior language learning experience of all participants.
Show answer & explanationAnswer & explanation
Correct answer: D. The study controlled for the prior language learning experience of all participants.
The platform claims its algorithm is superior to textbooks. If students using textbooks had varying levels of prior experience that weren't accounted for, it could skew the results. Controlling for prior experience (Option B) ensures that the observed difference is more likely due to the learning method itself rather than pre-existing abilities, thus strengthening the claim about the algorithm's superiority.
Why the other options are wrong
- A. A reliable measure of fluency is good for the study's validity, but it doesn't strengthen the *specific comparison* of the algorithm's superiority over textbooks; it just means the measurement itself is sound.
- B. This suggests textbooks might have external aids, potentially *weakening* the platform's claim by showing textbook users had advantages, or at least not strengthening the algorithm's superiority.
- C. While gamification might contribute to success, this option describes an additional feature of the platform, not necessarily inherent to the 'adaptive algorithm' itself, and doesn't directly strengthen the comparison against textbooks.
Strengthening Causal Claims by Controlling Variables
Enhancing the validity of a causal argument by demonstrating that other potential influencing factors were accounted for or eliminated.
- Reduces the likelihood of confounding variables.
- Makes the observed effect more attributable to the proposed cause.
- Often involves explicit mention of experimental controls or statistical adjustments.
Memory trick: To make your chain strong, remove all rust and test each link.