Does sleeping help improve GPA? A study was done to see if students who were sleeping for at least 8 hours a night on a regular basis had a higher GPA than those who were sleeping less than 8 hours a night. In this study, the explanatory variable is

Does sleeping help improve GPA? A study was done to see if students who were sleeping for at least 8 hours a night on a regular basis had a higher GPA than those who were sleeping less than 8 hours a night. In this study, the explanatory variable is

Number of hours a student sleeps

A student's GPA

Number of nights a student sleeps

The number of students surveyed in the study.