问题如下图：
选项：
A. 
B. 
C. 
解释：
怎么看出ρ12>ρ13呢？
李宗_品职助教 · 2018年01月04日
你好，使用计算机：2ND DATA输入数组（X,Y），然后2ND STAT，向下查看r
r（1，2）=-0.5，r（1，3）=-0.86
选择提供风险分散最小的组合，r越大，风险分散越少
ciaoyy · 2018年01月04日
我得到的最终答案跟你一样，但是每个r结果都不一样。我是这样使用计算器的，比如算r(1,2). X01=12,y0=12;x02=0,y02=6;x03=6,y03=0;x04=6,y04=6. 2ND STAT--最后得到r(1,2)=0.5。 以此类推，r(2,3)=-1, r(1,3)=-0.5 。其中r(1,2)最大，所以风险分散最小。 这里的r计算量指的就是ρ吗？
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