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【单选题】
随机抽取某市12名男孩,测得其体重均值为3.2公斤,标准差为0.5公斤,则总体数95%可信区间的公式是A.
3.2±t 0.05.11 ×0.5
B.
3.2±t 0.05.12 ×0.5/
C.
3.2±t 0 .05.11 ×0.5/
D.
3.2±1.96×0.5/
E.
3.2±2.58×0.5/
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举一反三
【单选题】I wonder how you finished the work.
A.
I want know how you finished the work.
B.
I want to know how you finished the work.
C.
I know how you finished the work.
D.
I want to know you how finished the work.
【单选题】—Do you know what people are saying about you? —Of course I know. But _____ is true, and I don’t care.
A.
nothing
B.
something
C.
everything
D.
none
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