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The Equal-Variances Test Statistic Of μ1−μ2\mu _ { 1 } - \mu _ { 2 }

Question 62

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The equal-variances test statistic of μ1−μ2\mu _ { 1 } - \mu _ { 2 } is Student t-distributed with n1 + n2 -2 degrees of freedom provided that the two populations are ____________________.

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