If level of education has four possible categories,four qualitative variables would be needed to represent education in the regression model.

Name: If level of education has four possible categories,four qualitative variables would be needed to represent education in the regression model.
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If level of education has four possible categories, only three qualitative variables would be needed to represent education in the regression model, as one category would serve as the reference group for comparison.

If Level of Education Has Four Possible Categories,four Qualitative Variables