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When the Population Variances Are Unequal,we Estimate Each Population Variance

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When the population variances are unequal,we estimate each population variance with its sample variance.Hence,the unequal-variances test statistic of When the population variances are unequal,we estimate each population variance with its sample variance.Hence,the unequal-variances test statistic of is approximately Student t-distributed with n<sub>1</sub> + n<sub>2</sub> − 2 degrees of freedom. is approximately Student t-distributed with n1 + n2 − 2 degrees of freedom.

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