Should these five variables be included as covariates?

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A researcher is planning to compare three groups of 20 individuals each in a randomized study. Suppose that he has included 10 females and 10 males in each of his groups. He is also contemplating whether to include five additional covariates in his model. a. Should gender be included in his model? Why or why not? b. Suppose he expects the five additional covariates to explain 9% of the variance in the dependent variable, controlling for the effect of gender. Should these five variables be included as covariates? Why or why not?

 

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