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【单选题】
设总体X～N(μ，σ2)，X1，X2，…，Xn(n≥3)是来自总体X的简单样本，则下列估计量中，不是总体参数μ的无偏估计的是( )。A.
B.
X1+X2+…+Xn
C.
0．1(6X1+4Xn)
D.
X1+X2-X3
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反馈参考答案：
举一反三
【单选题】Suppose a country has been running a persistent government budget deficit. If the deficit is reduced, but remains positive,
A.
government debt will increase.
B.
government debt will decrease.
C.
the country will experience a budget surplus.
D.
interest payments on the debt immediately will decrease.
【单选题】Suppose a country is producing $20 million of real GDP. If the economy grows at 10 percent per year, approximately how many years will to take for real GDP to grow to $80 million?
A.
14
B.
7
C.
4
D.
30
【单选题】Suppose a country is much richer than the others in the Solow growth model. What happens in the long run?
A.
The other countries catch up to the rich one.
B.
The rich country grows the fastest.
C.
The rich country becomes poorer than the others.
D.
Nothing.
【单选题】Suppose a country is producing $20 million of real GDP. If the economy grows at 10 percent per year, approximately how many years will to take for real GDP to grow to $80 million?
A.
14.00
B.
7.00
C.
4.00
D.
30.00
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