An investigator finds that it is possible to use measurements of people's speed of response as a moderately accurate predictor of their grades in school. From this information we can conclude that the correlation between speed of response and grades is

Question

Quizplus · Accepted Answer

Since the speed of response can predict grades with moderate accuracy, it indicates a relationship exists between the two variables, meaning the correlation is not zero. However, without specific directionality indicated (whether faster responses correlate with higher or lower grades), we cannot determine if the correlation is positive or negative, only that it is not zero.

An Investigator Finds That It Is Possible to Use Measurements