單項選擇題對于從所考察總體中隨機抽取的一個大樣本,其樣本均值近似服從()

A.正態(tài)分布
B.x2分布
C.t分布
D.均勻分布


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2.單項選擇題變量x和y的相關系數(shù)的符號,取決于()

A.變量x的標準差
B.變量y的標準差
C.變量x和y兩個標準差的乘積
D.變量x和y的協(xié)方差

3.單項選擇題對于同一數(shù)據(jù),所計算出的平均差與標準差相比,通常有()

A.平均差大于標準差
B.平均差小于標準差
C.平均差等于標準差
D.二者關系不定

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