Question: 9, Explain why we have N1 + N2 2 degrees of freedom when we pool the variances. (In other words, why do we gain degrees

9, Explain why we have N1 + N2 2 degrees of

freedom when we pool the variances. (In other words, why do we

9, Explain why we have N1 + N2 2 degrees of freedom when we pool the variances. (In other words, why do we gain degrees of freedom when we pool?)

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