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[单选题]

What is the most appropriate test statistic for constructing confidence intervals for the population mean when the population is normally distributed, but the variance is unknown?

A.The z-statistic at with n degrees of freedom.

B.The t-statistic at /2 with n degrees of freedom.

C.The t-statistic at /2 with n-1 degrees of freedom.

参考答案与解析：

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