The standard deviation of the market-index portfolio is 20%. Stock A has a beta of 1.5 and a residual standard deviation of 30%. (LO 6-5) a. What would make for a larger increase in the stock's variance: an increase of .15 in its beta or an increase of 3% (from 30% to 33%) in its residual standard deviation?
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The formula for the variance of a stock based on its beta is: \[ \text{Variance}_{\text{market}} = \beta^2 \times \text{Variance}_{\text{market-index}} \] Given that the standard deviation of the market-index portfolio is 20%, the variance of the market-index Show more…
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