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【单选题】
假设yt = 0.4 + et+ 0.5 et-1 - 0.3 et-2，yt 的无条件均值等于？
A.
0.5
B.
0.8
C.
0.4
D.
0.3
参考答案：
参考解析：
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A.
The research methods used by scientists.
B.
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C.
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D.
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【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