Professor Jones surveyed her six classes and found that students who slept less than five hours the night before the exam received lower exam scores than those students who slept seven hours or more.What kind of correlation is this relationship between hours of sleep and scores?
A)positive
B)negative
C)zero
D)causal

Question

Quizplus · Accepted Answer

A positive correlation exists when an increase in one variable (hours of sleep) is associated with an increase in another variable (exam scores).

Professor Jones Surveyed Her Six Classes and Found That Students