Examine the following correlation coefficients for two variables. Discuss how you interpret each of them. What does the correlation coefficient tell you about the relationship between the two variables?

Situation 1

r = 0.9

Variable 1: yield of corn

Variable 2: use of fertilizer

Situation 2

r = - 0.7

Variable 1: Number of absences

Variable 2: Earned grade

Situation 3

r = 0.12

Variable 1: Number of cups of coffee consumed in the day

Variable 2: IQ