THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

Multiple Choice

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A professor of statistics is interested in studying the relationship between the number of hours graduate students spent studying for his comprehensive final exam and the exam score.The results of the regression analysis of hours studied on exam scores are presented below.
-The covariance between the two variables x and y:

A) has the same sign as the coefficient of correlation.
B) is always greater than zero.
C) is always smaller than zero.
D) is computed by dividing
by the number of (x,y) pairs.