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【单选题】
根据国际清算银行的统计数据,全球外汇交易额中有()的交易是投机性交易。A.
60%
B.
70%
C.
80%
D.
90%
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【单选题】对同一个资料作假设检验，若把犯第一类错误的概率α定得很小，则对犯第二类错误的概率β而言
A.
β 也变小
B.
β 变大
C.
β 与 α 始终相等
D.
β变大变小无法确定
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