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What is the appropriate test statistic for constructing confidence intervals for the population mean of a normal distribution when the population variance is unknown? A. The t-statistic at α/2 with n degrees of freedom. B. The z-statistic with n – 1 degrees of freedom. C. The z-statistic at α with n degrees of freedom. D. The t-statistic at α/2 with n – 1 degrees of freedom. |