An article in the Journal of the American Medical Assocation

An article in the Journal of the American Medical Assocation described an experiment to investigate the effect of four treatments on various body characteristics. In this double-blind experiment, each of 58 female subjects age 65 or older was assigned at random to one of the following four treatments: The change In body fat mass was measured over the 26-weok period following the treatments. Using the Information provided above and in tire partial table below, complete the ANOVA table

Solution

Source of variation

df

sum of squares

mean squares

F

Treatment

4-1=3

227.88-143.1=84.78

84.78/3 = 28.26

28.26/2.65=10.66

Error

57-3=54

2.65(54)=143.1

2.65

Total

58-1=57

227.88

Source of variation	df	sum of squares	mean squares	F
Treatment	4-1=3	227.88-143.1=84.78	84.78/3 = 28.26	28.26/2.65=10.66
Error	57-3=54	2.65(54)=143.1	2.65
Total	58-1=57	227.88