An article in the Journal of the American Medical Assocation described an experi

Question

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 65 female subjects age 65 or older was assigned at random to one of the following four treatments 1) P P: placebo "growth hormone" and placebo "steroid" 2) P + S: placebo "growth hormone" and the steroid estradiol 3) G P: growth hormone and placebo "steroid" 4) G +S: growth hormone and the steroid estradiol The change in body fat mass was measured over the 26-week period following the treatments. Using the information provided above and in the partial table below, complete the ANOVA table (use 2 decimals for your answers) Source of Variation Treatment Error Sum of Squares Mean Square 1.86 216.27

Explanation / Answer

ANOVA Table

Treatments=4

n=65

We have SStotal=SStreatment+SSError

MST=(SST)/df

MSE=(SSE)/df

F=(MST)/(MSE)

SV df SS MS F Treatments 3 102.81 34.27 18.42473 Error 61 113.46 1.86 Total 64 216.27

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