Which of the following control variables would be more likely to cause bias due to being a

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Which of the following control variables would be more likely to cause bias due to being a mediating factor for estimating the effect of class size on 6th-grade student math achievement? What would be the likely direction of the bias from including the control variable? Explain. 

Control variable 1: The amount of parental help on homework. 

Control variable 2: The amount of individual time with the teacher.

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