Both the equal-variances and unequal variances test statistic and confidence interval estimator of require that the two populations be normally distributed.
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Q11: In testing the difference between two population
Q14: The quantity Q17: The variance of Q18: In testing the difference between the means Q19: Two independent samples of sizes 20 and Q20: When the sample sizes are equal,the pooled Q20: The equal-variances test statistic of Q21: Two independent samples of sizes 40 and Q128: The pooled-variances t-test requires that the two Q133: Two samples of sizes 25 and 20
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