甲地区200名15岁男孩与乙地区200名15岁男孩身高均数之差的检验为

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问题单项选择题 B1型题

甲地区200名15岁男孩与乙地区200名15岁男孩身高均数之差的检验为（）

A.样本均数与总体均数的t检验

B.μ检验

C.成组t检验

D.配对t检验

E.以上均不是

答案

参考答案：B

补全对话，情景问答

图完成对话

A: (1)__________ this?

B: It's a (2)__________.

A: Spell it, please.

B: (3)__________.

A: And what's this (4)__________ English?

B: It's a (5)__________

A: Spell it, please.

B: R -U -L-E -R.

选择题

As we all know the H1N1 Flu is so serious, students can't go into the school ______ they take the

temperature and get sure they don't have a fever. [ ]

A. till

B. after

C. when

D. until