Your instructor notices that in many of his classes, the longer he lectures, the more students yawn. This represents:
A)a positive correlation.
B)a negative correlation.
C)a cause-and-effect relationship.
D)scientific proof that yawning is contagious.

Question

Quizplus · Accepted Answer

A positive correlation is observed here because as the length of the lecture increases (one variable), the number of students yawning (another variable) also increases. This means both variables move in the same direction, which defines a positive correlation.

Your Instructor Notices That in Many of His Classes, the Longer