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Trying to figure out the steps to the follow to answer the following question: 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%.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% in its residual standard deviation?b. An investor who current holds the market index portfolio decides to reduce the portfolio allocation to the market index to 90%, and to invest 10% in stock A. Which of the changes in (a) will have a greater impact on the portfolio’s standard deviation?
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