Question: professor mark in his probability and statistics class wanted to know if students that took college algebra before taking the course did any better than

professor mark in his probability and statistics class wanted to know if students that took college algebra before taking the course did any better than other. because a few senior and sophomore students took this junior class, he wanted to know if student classification also affected performance in the course.

a. what was professor marks dependent variable?

b. what was his independent variable?

c. which variable could be a control variable and why?

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