题目内容
正态分布资料σ未知，95%可信区间的计算公式为
2021-10-11
A.平均数±1.96S
B.平均数±2.58S
C.平均数±t0.05，v标准误
D.平均数±t0.01，v标准误
E.平均数±2.58标准误
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