單項(xiàng)選擇題置信水平既定,則樣本量變大,置信區(qū)間()

A.變窄
B.變寬
C.不變
D.不能確定


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1.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

2.單項(xiàng)選擇題中心極限定理表明,若容量為n 的樣本來(lái)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(shí),為正態(tài)分布
C.只有當(dāng)n≥30時(shí),為正態(tài)分布
D.非正態(tài)分布

3.單項(xiàng)選擇題若總體服從正態(tài)分布,那么樣本量() , 樣本均值的抽樣分布服從正態(tài)分布.          

A.足夠大時(shí)
B.足夠小時(shí)
C.無(wú)論大與小
D.無(wú)法判斷

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