For each of the following statements, say what, if anything, is wrong.
a. Because the correlation coefficient between test time and test score is −0.56, the correlation coefficient between test score and test time must be 0.56 (the positive value).
b. There is a strong positive correlation between a person’s yard size and whether or not they have a dog.
c. For a sample of 50 students, the correlation coefficient between weight (kg) and height (inches) was found to be 0.78 kg/inches.
d. A correlation coefficient of r = 0.84 denotes just as strong a relationship as a correlation coefficient of r = −0.84.