Inthe T pivotalquantityforcomparingtwomeans,explainwhy X2 = (n1 + n2 2)S2~2 has a chi-squareddistributionwith d = n1 +

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Inthe T pivotalquantityforcomparingtwomeans,explainwhy X2 = (n1 + n2 − 2)S2~σ2 has a chi-squareddistributionwith d = n1 + n2 − 2 degrees offreedom.

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Cyrus Sandoval

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