题目内容
(请给出正确答案)
[单选题]
设一批零件的长度服从正态分布,其中均未知,现从该总体中抽取个零件,测得样本均值,样本标准差. 则的置信水平为的置信区间为()
A.
B.
C.
D.
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A.
B.
C.
D.
第6题
A、acne
B、diarrhoea
C、vomit
D、sprain
第7题
A、He was already dissatisfied with himself.
B、He was very happy because he had many friends.
C、He was very lonely.
D、He was content with his family.
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