【单选题】【消耗次数:1】
随机地从一批零件中抽取16个,测的长度(cm)为:2.14,2.10,2.13,2.15,2.13,2.12,2.13,2.10,2.15,2.12,2.14,2.10,2.13,2.11,2.14,2.11,设零件长度分布为正态分布,若σ=0.01(cm),则总体μ的90%的置信区间为( )
(1.013,1.765)
(2.121,2.129)
(3.135,3.896)
(3.596,4,523)
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【单选题】 随机地从一批零件中抽取16个,测的长度(cm)为:2.14,2.10,2.13,2.15,2.13,2.12,2.13,2.10,2.15,2.12,2.14,2.10,2.13,2.11,2.14,2.11,设零件长度分布为正态分布,若σ=0.01(cm),则总体μ的90%的置信区间为( )
①  (2.121,2.129)
②  (2.3,2.6)
③  (3.121,3.129)
④  (3.671,4.129)
【单选题】 随机地从一批零件中抽取16个,测的长度(cm)为:2.14,2.10,2.13,2.15,2.13,2.12,2.13,2.10,2.15,2.12,2.14,2.10,2.13,2.11,2.14,2.11,设零件长度分布为正态分布,若σ未知,则总体μ的90%的置信区间为( )
①  (4.012,4.765)
②  (1.235,2.018)
③  (3.213,3.970)
④  (2.1175,2.1325)
【单选题】 随机地从一批零件中抽取16个,测的长度(cm)为:2.14,2.10,2.13,2.15,2.13,2.12,2.13,2.10,2.15,2.12,2.14,2.10,2.13,2.11,2.14,2.11,设零件长度分布为正态分布,若σ未知,则总体μ的90%的置信区间为( )
①  (3.1175,4.1325)
②  (2.1175,2.1325)
【判断题】 一批工件的尺寸服从正态分布,则这批零件的随机误差是6σ。()
①  正确
②  错误
【判断题】 一批工件的尺寸服从正态分布,则这批零件的随机误差是6σ。
①  正确
②  错误
【单选题】 已知一批零件的尺寸服从正态分布,则在加工误差统计分析中,6σ表示()。
①  实用分散范围
②  随机误差大小
③  工序加工精度的高低
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【判断题】 切削加工一批零件时,如果对刀不准就会引起随机误差。()
①  正确
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【单选题】 从一个二项分布总体中抽取容量为100的随机样本,则样本均值的抽样分布近似服从
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②  正态分布
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④  F分布
【单选题】 下列零件中,()属于专用零件。
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【单选题】 一个孔的公称尺寸是Φ30,上极限偏差为+0.033,下极限偏差为0,一个零件的测量值是Φ30,则该零件是( )
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②  不合格品
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【单选题】 I am going away. or not she will go is up to her to decide.
①  if
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【单选题】 _________ the information about this product, you can contact the sales department of our company.
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