a. How do the variable in the research study which uses the Pearson r correlation coefficient differ from the variable in study that employs the point-biserial correlation coefficient?
b. Is the process for computing a point-biserial correlation different from procedure for calculating a Pearson r correlation coefficient? Why or Why not?
c. Is the process for testing a Pearson r correlation coefficient for statistical significance different from procedure from testing a point-biserial correlation coefficient for statistical significance? Why or why not?
d. In what way is the meaning of squared point-biserial correlation coefficient the same as the meaning of the squared Pearson r correlation coefficient? Are there any difference between these two squared measures?