Two variables, Variable X and Variable Y, are the focus of a study. The study involves 25 research participants. The sum of the cross products (ZX • ZY) for the 25 cases is 21.58.
a. Calculate and interpret r.
b. Calculate and interpret r2.
c. Assuming you were to test the significance of r at the .05 level of significance, state an appropriate null hypothesis. What would you conclude?