如果两个证券收益率之间表现为同向变化，它们之间的协方差和相关系数就会是负值。()
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基础代谢率的正常范围是不超过正常平均值的
A. ±5％～±10％
B. ±0％～±5％
C. ±10％～±15％
D. ±20％～±30％
E. ±30％一±40％
Teenagers whose parents smoke are at risk of getting lung cancer at some time during their
A. YES
B. NO
C. NOT GIVEN
The total quantity of water on Earth______
A. remains almost unchanged.
B. has greatly increased in recent years.
C. is decreasing constantly.
D. is affected by global warming.
假设A证券的标准离差是12%，B证券的标准离差是20%，AB证券之间的预期相关系数为0.2，在资产组合中A证券占的比例为70%，B证券占的比例为30%，则AB资产组合收益率的标准离差为11.26%。()
A. 正确
B. 错误
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