Researchers wanted to test the happiness score across 3 time-points   Happiness 1 Happiness 2 Happiness  3 22 38 42 31 40 50 20 32 43 23 33 37   Match each source of variability to the appropriate df    dfHappiness Answer 1 dfSubjects Answer 2 dfError (i.e., dfwithin) Answer 3 dfTotal Answer 4