What are the degrees of freedom for the error term

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Reference no: EM131429797

An experiment was conducted to compare three different instructional strategies. Fifteen subjects were included in each group. The same test was administered prior to and after the treatments. If both pretest and IQ are used as covariates, what are the degrees of freedom for the error term?

a. 2

b. 40

c. 41

d. 42

Reference no: EM131429797

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