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[单选题]

William Adams wants to test whether the mean monthly returns over the last five years are the same for two stocks. If he assumes that the returns distributions are normal and have equal variances, the type of test and test statistic are best described as:

A.Paired comparisons test,t-statistic

B.Paired comparisons test,F-statistic

C.Difference in means test,t-statistic

参考答案与解析：

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