The numerator of the standardized difference formula contains ______________________ while the denominator contains _________________________. Question 4 options: a. the absolute value of the sample means; the square root of the average of the sample variances b. the absolute value of the sample means; the absolute root of the sample variances c. the squared absolute value of the sample means; the square root of the average of the sample variances d. the absolute value of the sample variances; the square root of the average of the sample variances