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【单选题】
下列关于总体均数置信区间的论述正确的是A.
求出总体均数置信区间后，即可推、断总体均数一定会在此范围内
B.
总体均数 95 ％置信区间的公式是 x ̅±t 0.05 , v S
C.
总体均数的区间估计是一种常用的参数估计方法
D.
无论样本大小，估计总体均数时近似用 1 ． 96S 代替
E.
总体均数 99 ％置信区间的公式是 x ̅±t 0.05 , v S
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A.
How long
B.
How old
C.
How often
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A.
They were shown how by the Indians.
B.
They changed their wheat bread recipes.
C.
They knew the technique before they arrived in America.
D.
They tried to make more nutritious bread.
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When
B.
How long
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How
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How often
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A.
myself
B.
yourself
C.
herself
D.
himself
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How long
B.
How old
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How many
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【单选题】听力原文：M: How did your interview go? W: I couldn't feel better about it. What do we learn from the conversation?
A.
The woman is sick.
B.
The woman is worried about her interview.
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The woman is confident.
D.
The woman is feeling better.
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A.
him
B.
himself
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