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【单选题】
假设y t = 0.4 + e t + 0.5 e t-1 - 0.3 e t-2 , y t 的无条件均值等于?
A.
0.5
B.
0.3
C.
0.8
D.
0.4
参考答案：
参考解析：
刷刷题刷刷变学霸
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A.
The research methods used by scientists.
B.
Observation and human perception variation.
C.
The relation between hypothesis and observation.
D.
The human perceptual mechanism.
【单选题】在Excel中，假设B1、B2、C1、C2单元格中分别存放1、2、6、9，SUM(B1：C2)和AVERAGE(B1，C2)的值等于()。
A.
18，5
B.
10，5
C.
18，10
D.
10，10