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下列关于假设检验的描述,正确的是(   )


A.
假设检验的结果是确切无误的,因此不可能有错误出现

B.
统计学得出差异有显著性的结论,并不一定专业上有意义

C.
t检验适用于各种类型的计量资料,不需要满足方差齐性等条件

D.
两样本均数比较,若P<0.01则可认为两者实际差别很大
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