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【多选题】
在假设检验中,往往会犯两种类型的错误,对于第 II 类型的错误说法准确的是A.
第 Ⅱ 类错误叫做“”错误，这是由于取样不确定性本质造成的，该错不可以避免
B.
当规定了小概率的临界值α时，就可以知道犯 Ⅱ 类错误的概率不会超过α
C.
严格的说，犯 Ⅱ 类错误是一个条件概率，即P（接受 l 是不正确的，μ= ）
D.
犯 Ⅱ 类错误概率记为β，其中 实际上是要检验总体的
E.
因为β和 有关，而α是犯 Ⅰ 类错误的概率，所以β与α无关
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A.
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B.
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【简答题】Everyone knows what a needle is. Of course there are needles and needles, Needles for sewing machines, needles for injection(注射), you name it. But few people think of the wonder a needle works in the ...
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A.
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B.
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C.
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D.
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A.
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B.
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C.
0.5mec2
D.
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