Which of the following statements is true of self-confidence?
A. It includes being arrogant and prideful.
B. It causes one to become jaded and pessimistic.
C. It involves managing competing points of view.
D. It includes knowing and trusting in oneself.
查看答案
People in organizations rise to the top because they:
A. refrain from creating hopes that things will turn out well.
B. have the ability to identify problems.
C. can instill in others a sense of hope for the future.
D. are always cautious when interpreting situations.
如果变量x和y之间的相关系数为-1，这说明两变量之间是（ ）
A. 低度相关关系
B. 完全相关关系
C. 高度相关关系
D. 完全不相关
己知某产品产量与生产成本有直线关系,在这条直线上,当产量为1000件时,其生产成本为50000元,其中不随产量变化的成本为12000元,则成本总额对产量的回归方程是()
A. Y=12000+38X
B. Y=50000+12000X
C. Y=38000+12X
D. Y=12000+50000X
直线回归方程
A. 建立前提条件是现象之间具有较密切的直线相关关系
B. 关键在于确定方程中的参数a和b
C. 表明两个相关变量间的数量变动关系
D. 可用来根据自变量值推算因变量值，并可进行回归预测
E. 回归系数b=0时，相关系数r=0
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