Student: The majority of the 50 students in my class answered at least 80% of the questions correctly on last year’s Algebra I exam. If these final exam scores do accurately measure the level of a student’s level of understanding, Marc must have learned less about Algebra last year than most other students in the class because he answered only 75% of the questions correctly on the Algebra I exam.
Which of the following, if true, most seriously, weakens the student’s argument?
A. Seven students answered less than 75% correctly on the exam.
B. Marc is one of four students in the class who did not take an introductory level Algebra course before Algebra I.
I marked A but the OA is B. Still not convinced. Please help!
B is correct. It shows that the comparison is not parallel. It was a apple vs orange comparison. Marc's background was not similar to most of the students.
Ans choice A is incorrect: It does not hurt the conclusion. In-fact it is consistent with the conclusion. majority of 50 means greater than 25. So if let say 30 students scored more than 80% & 7 scored less than 75%, it is not hurting the conclusion.
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