The best estimator of the difference between two population means is the difference between two sample means
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Q6: The expected value of Q8: In testing the difference between two population Q9: The variance of Q11: In testing the difference between two population Q12: The equal-variances test statistic of Q45: Two measurements from the same individuals is Q59: A matched pairs experiment decreases variability (compared Q77: Independent samples are those for which the Q128: The pooled-variances t-test requires that the two Q133: Two samples of sizes 25 and 20
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