Incorrect

You answered: "Attendance isn't related to grades."

If attendance is not related to grades then people who attended less would be just as likely to obtain high exam scores as those people who attended most of the lectures. That relationship might look like this:

 

Looking at the scores for people who attended 2 or 3 times, what would you conclude about their test scores? Do they tend to score high or low?

Now looking at those people who attended most of the lectures (11 or 12), what would you conclude about their test scores? Do they tend to score high or low?

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