An investigator is studying the effect of the number of hours watching television (Factor A) on the percent of hemoglobin A1c in people with type 2 diabetes mellitus. Two different variables, Factor A and hemoglobin A 1c, are compared. The results of the study indicate a correlation coefficient of +0.9. Which of the following graphs shown best corresponds to these results?
Correct answer : A
Since the correlation coefficient is positive, Hemoglobin A1c increases with increase of number of hours of watching television.