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4. Why is it better to omit a predictor from a model that might have a small effect (small slope) on the response, instead of

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4. Why is it better to omit a predictor from a model that might have a small effect (small slope) on the response, instead of including a variable which has no effect on the response? To answer this question describe the effect of those decisions on the mean and variance of estimators of the slopes

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