问题
单项选择题
衡量估计偏差的特征数是( )。
A.方差
B.加权平均值
C.期望值
D.标准方差
答案
参考答案:A
衡量估计偏差的特征数是( )。
A.方差
B.加权平均值
C.期望值
D.标准方差
参考答案:A
完成对话。 Jenny: So, Betty, what does your father do? Betty: 66 Jenny: Do you want to be a policewoman? Betty: Oh, yes. 67 but it’s also an exciting job. Jenny, your father is a bank clerk, right? Jenny: 68 Sam: Do you want to be a bank clerk, too? Jenny: No, not really. I want to be a reporter. Sam: Oh, yeah? Why? Jenny: It’s very busy, but it’s also fun, too. You meet so many interesting people. 69What does he do? Sam: He’s a report at the TV studio. It’s an exciting job, but it’s also very difficult. 70 I want to be reporter, too.
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