问题
单项选择题
A sample has 64 observations with a mean of 30 and standard deviation of 20. If the reliability factor is 2.05, the upper confidence limit for the population mean is closest to:（）
A. 30.64
B. 32.50
C. 35.13
答案
参考答案：C
解析：
对于上限：30+2.05×20/641/2=35.13。
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