Question: Solve When should we use a matched pairs method for testing two population means? Only when the population variances are unknown Only when the population

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When should we use a matched pairs method for testing two population means? Only when the population variances are unknown Only when the population variances are known Only when the sample sizes from the two groups are equal. Only when the sample standard deviations from the two groups are approximately equal. Only when there is a link between observations in each of the two samples defined in the experimental design

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