下列对于样本规模的表述,正确的是
A.在给定抽样精度后,总体异质性程度越大,所需样本规模也越小
B.在给定抽样精度后,总体异质性程度越小,所需样本规模也越小
C.样本占总体的比例与抽样精度之间是ー种正向的线性关系
D.抽样精度按比例地随着样本规模的增大而降低
正确答案是B
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