medium · GMAT Verbal
A Harbor Mill trial found that classes that used curriculum M scored higher than classes that used curriculum N, but the M classes also had smaller rosters. A reviewer notes that class size independently predicts scores. The reviewer concludes that the trial, as reported, does not yet show that ________.
Which of the following most logically completes the passage?
- curriculum M itself, rather than the smaller rosters, produced the higher scores
- any subject improved at all, which is enough to prefer M
- the alternative is used at other sites
- the confound can ever affect the outcome
- the trial enrolled any members of the confounded group
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