刘同学2018-05-20 16:41:08
An analyst gathered information about three economic variables, He noted that whenever variable A increased by one unit, variable C increased by 0.6 units but variable B decreased by 0.7 units. The correlation between variables A and B and the correlation between variables A and C respectively, are closest to: A Answer A B Answer B C Answer C 这题在问啥?
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张玮杰2018-05-21 15:42:02
同学你好,这题考察的是相关性,相关性是数据之间的变动关系,题目里说了,A上升,C也一定上升,A上升,B也一定下降,这表示一种很完美的线性关系,注意是一个变量一定跟着另一个变量变动,所以是完全正相关和完全负相关的关系,而变动多少个单位是它们的斜率。
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ry2018-07-26 23:02:47
为什么不是选B
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