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.無論大與小
D.無法判斷


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