Variance produces between 20 and Swithin 40, then n = 0.50. 11. A researcher reports an F-ratio with df = 2, 18 from an independent-measures research study. Based on the df values, how many treatments were compared in the study, and what was the total number of subjects participating in the study? a. 2 treatments and 19 subjects c. 2 treatments and 20 subjects b. 3 treatments and 21 subjects d. 3 treatments and 22 subjects