Question 7 (2 points) Rachel performed an experiment testing the hours students slept with their
performance on a test. In this experiment, the hours that they slept was the variable, while the grade they got on
the test was the
variable.

This has to do with independent and dependent variables. The independent variable is what affects the dependant variable, so the question is, does a students mark on a test affect their hours of sleep or does their hours of sleep affect their test results? Which one makes more sense? I would say the latter.