Which of the following is an appropriate null hypothesis for a Pearson r test? a. The means of the two variables do not differ in the population. b. There is no relationship between the two variables...

Which of the following is an appropriate null hypothesis for a Pearson r test?

a. The means of the two variables do not differ in the population.

b. There is no relationship between the two variables in the population.

c. There is a negative relationship between the two variables in the sample.

d. Both (b) and (c).