Professor Jones surveyed her six classes and found that students who slept less than 5 hours the night before an exam received lower exam scores than those students who slept 7 hours or more. What kind of correlation is this relationship between hours of sleep and scores?

Positive correlation

Explanation

In statistics, Correlation measures the degree to which two variables are linearly related and it has direction either positive or negative.

Positive correlation shows the two variables move in the same direction an increase of one will in turn increase the other.

Negative, the two variables will move to the opposite direction. An increase in one variable decreases the other.

Hours of sleep and Exam scores are positively correlated. Since a decrease in the number of hours of sleep lead to the decrease in the exam score.