單項(xiàng)選擇題在其它條件相同的情況下,95%的置信區(qū)間比90%的置信區(qū)間()

A.要寬
B.要窄
C.相同
D.可能寬也可能窄


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1.單項(xiàng)選擇題中心極限定理表明,若容量為n 的樣本來自非正態(tài)總體,則樣本均值的抽樣分布為()

A.正態(tài)分布
B.只有當(dāng)n<30時,為正態(tài)分布
C.只有當(dāng)n≥30時,為正態(tài)分布
D.非正態(tài)分布

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在組距數(shù)列中,下限就是()

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The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the approximate range of the number of phone calls arriving each hour?()

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The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the cumulative frequency of the third class?()

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Descriptive statistics deals with methods of()

題型:單項(xiàng)選擇題