# Regression: Pre-requisite Review–Question 1

#### Question 1

A professor is interested in the relationship between attendance and exam grades. The professor gives an exam during the fifth week of class. In addition to the exam grade, the professor also records the number of class sessions attended by each student (12 possible).

The graph below summarizes the relationship.

Question: How would you describe this relationship?

Correct!

#### Less attendance is associated with better grades, more attendance is associated with worse grades.

Incorrect.

Looking at the graph above, focus on low attendance scores such as 2, 3, and 4. Do these individuals score higher or lower? Now look at those who attended the most such as 10,11, and 12. Did these people tend to score higher or lower?

#### Attendance isn’t related to grades.

Incorrect.

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 in the first graph, 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) in the first graph, what would you conclude about their test scores? Do they tend to score high or low?