=31.645,样本方差s2=0.O9,则总体均值μ的置信度为0.98的

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问题 =31.645,样本方差s2=0.O9,则总体均值μ的置信度为0.98的置信区间为( )。A.(30.88,32.63)B.(31.45,31.84)C.(31.62,31.97)D.(30.45,31.74)

选项 A.(30.88,32.63)
B.(31.45,31.84)
C.(31.62,31.97)
D.(30.45,31.74)

答案 B

解析
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