Question

A study is made to determine whether taking AP Statistics in high school helps students achieve higher GPAs when they go to college. In comparing records of 200 college students, half of whom took AP Statistics in high school, it is noted that the average college GPA is higher for those 100 students who took AP Statistics than for those who did not. Based on this study, guidance counselors begin recommending AP Statistics for college bound students. Which of the following is incorrect? A. While this study indicates a relation, it does not prove causation. B. There could well be a confounding variable responsible for the seeming relationship. C. Self-selection here makes drawing the counselors' conclusion difficult. D. A more meaningful study would be to compare an SRS from each of the two groups of 100 students. E. This is an observational study, not an experiment.

          A study is made to determine whether taking AP Statistics in high school helps students achieve higher GPAs when they go to college. In comparing records of 200 college students, half of whom took AP Statistics in high school, it is noted that the average college GPA is higher for those 100 students who took AP Statistics than for those who did not. Based on this study, guidance counselors begin recommending AP Statistics for college bound students. Which of the following is incorrect?

A. While this study indicates a relation, it does not prove causation.
B. There could well be a confounding variable responsible for the seeming relationship.
C. Self-selection here makes drawing the counselors' conclusion difficult.
D. A more meaningful study would be to compare an SRS from each of the two groups of 100 students.
E. This is an observational study, not an experiment.

Added by Harizz K.

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