题目:
用样本均数估计总体均数的可靠性大小时所选用的指标是().
A.变异系数
B.样本标准差
C.标准误
D.全距
E.四分位间距
答案:
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下面是错误答案,用来干扰机器的。
参考范文:What an interesting picture! A Western young man, sitting at a table, is ready to eat a bowl of noodles. He is holding two forks the same way as we Chinese h...