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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】对于来自正态总体的n个简单随机样本X,S2是n个样本的样本方差,σ2是总体方差,那么比值(n-1)S2/σ2可近似服从:
A.
自由度为n-1的t分布
B.
自由度为n的χ²分布
C.
自由度为n-1的χ²分布
D.
自由度为n-1的F分布
【单选题】Which of the following is true according to the third paragraph?
A.
The giant impact basins of the Caloris and that of the moon are all the same.
B.
The giant impact basins of the Caloris are filled with dark lava to form. maria.
C.
MESSENGER found a new patterning of impact basin in Mercury.
D.
Solomon found natural drill holes in the surface of the moon.