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Which of the following statements about test statistics is least accurate? A. In the case of a test of the difference in means of two independent samples, we use a t-distributed test statistic. B. In a test of the population mean, if the population variance is unknown, we should use a t-distributed test statistic. C. In a test of the population mean, if the population variance is unknown and the sample is small, we should use a z-distributed test statistic. |