medium · LSAT Logical Reasoning
A study found that high school students who play chess tend to have higher grade point averages than students who do not. A school administrator proposed that all students should be required to play chess to improve the school's overall academic performance.
Which one of the following, if true, most seriously weakens the administrator's proposal?
- Students who are already doing well academically tend to be the ones who choose to take up chess
- Many students find learning to play chess to be difficult and frustrating
- Playing chess consumes a sizable block of time that might otherwise go to studying other subjects
- The study drew its sample of students from only three different high schools
- Some teachers lack the training needed to instruct students in chess effectively
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