设总体X的概率密度为f(x),x1 ,x2,…,xn 为来自该总体的样本,则样本的联合概率密度函数为
A.f(x)
B.f(x1)+f(x2)+…+ f(xn)
C.fn(x)
D.f(x1)f(x2)… f(xn)
正确答案是D
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