问题
单项选择题
在抽样中其他条件不变时，如果样本量扩大为原来的4倍，则样本均值的标准误差将是原来的（）。
A．2倍
B．4倍
C．50%
D．25%
答案
参考答案：C
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在抽样中其他条件不变时，如果样本量扩大为原来的4倍，则样本均值的标准误差将是原来的（）。
A．2倍
B．4倍
C．50%
D．25%
参考答案：C
| 完型填空。 It is a fine Sunday morning. Ann and her mother are on a big bus. There are _1__ people on it. Some _2_ from America, and some come _3__ England and Canada. They are _4__ friends. They are going to the Great Wall. _5__ are two Chinese on the bus. _6__ is a woman. She is _7__ the bus. The other is young man. He __8_ English very well. He is talking _9_ the Great Wall. Other people are all listening to him. They like the Great Wall very much. They want to see _10_. | ||||
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