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Financial Risk Manager Part 1

Financial Risk Manager Part 1

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Assuming that the covariance of returns of Stock X and Stock Y is Cov(Rx, Ry) = 0.093, the variance of Rx = 0.69, and the variance of Ry = 0.36, the correlation of returns of Stock X and Stock Y is closest to:

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Explanation:

The correlation coefficient is calculated using the formula:

Corr(Rx,Ry)=Cov(Rx,Ry)σ(Rx)σ(Ry)\text{Corr}(R_x, R_y) = \frac{\text{Cov}(R_x, R_y)}{\sigma(R_x)\sigma(R_y)}Corr(Rx​,Ry​)=σ(Rx​)σ(Ry​)Cov(Rx​,Ry​)​

First, we need to find the standard deviations from the variances:

  • σ(Rx)=0.69=0.8306\sigma(R_x) = \sqrt{0.69} = 0.8306σ(Rx​)=0.69​=0.8306
  • σ(Ry)=0.36=0.6\sigma(R_y) = \sqrt{0.36} = 0.6σ(Ry​)=0.36​=0.6

Now plug into the correlation formula:

Corr(Rx,Ry)=0.0930.8306×0.6=0.0930.49836=0.1865\text{Corr}(R_x, R_y) = \frac{0.093}{0.8306 \times 0.6} = \frac{0.093}{0.49836} = 0.1865Corr(Rx​,Ry​)=0.8306×0.60.093​=0.498360.093​=0.1865

Therefore, the correlation coefficient is 0.1865, which corresponds to option B.

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