A preparation of insulin is being studied to determine the effects on reducing t

Question

A preparation of insulin is being studied to determine the effects on reducing the Wood-sugar level in rats. 25 rats of identical breed are randomly injected with different dosages of insulin (X) and reduction rate in their blood-sugar levels (Y) are recorded. The results are summarized as: sigma X = 150 sigma X^2 = -1000 sigma Y = 50 sigma Y^2 = 693 sigma XY = 450 And the incomplete Analysis of Variance table is given as: What are the degrees of freedom for the Error term in the analysis of variance table?

Explanation / Answer

Since, there is only one predictor variable - Dosage of Insulin.

Hence, Degrees of freedom for Regression term = 1

Total degrees of freedom = 24

Hence, degrees of freedom for Error term = 24 - 1 = 23

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