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GRE Sample Test 5 Verbal Reasoning 2

18
Question 18 is based on the passage below. Select one answer choice.
At the end of each school year, University Z requires all students who enrolled in calculus to take a standardized final. This year, students in Professor Doyle’s course scored higher, on average, than did the students in any other course. Since student placement in calculus courses is randomized, the superior performance of Doyle’s students is clearly attributable to his teaching ability.

Question : 18

Total: 20

Which of the following, if true, would most weaken the argument?

Calculus is the most advanced math course offered at University Z.
Because of the rigor of Professor Doyle’s course, a greater percentage of students dropped his course than did the students in any other Calculus course.
Professor Doyle is known to have an unorthodox teaching style.
Student ratings of Professor Doyle were no greater than the average rating for other calculus professors.
University X has a nationally ranked mathematics program.

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