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[单选题]

A sample of 100 observations drawn from a normally distributed population has a sample mean of 12 and a sample standard deviation of 4. Using the extract from the z-distribution given below, find the 95% confidence interval for the population mean.

The 95% confidence interval is closest to:

A.7.840 to 27.683

B.11.216 to 12.784

C.11.340 to 12.660

参考答案与解析：

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