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CFA Level I · CFA Level I Exam · The Capital Asset Pricing Model, Market Model, and Other Factor-Based Equity Models

A stock has a covariance with the market return of 0.0360. The market return has a standard deviation of 20%. The stock's estimated beta is closest to:

Beta equals covariance divided by market variance. The market variance is 0.20 squared, or 0.04, so beta is 0.0360 divided by 0.04, which is 0.90. Dividing by the standard deviation instead of the variance is the common error.

  1. A0.72
  2. B0.90Correct
  3. C1.80

Explanation

Market variance = 0.20^2 = 0.04. Beta = 0.0360/0.04 = 0.90. Using the standard deviation (0.0360/0.20 = 0.18) or the variance inverted would be wrong, and 1.80 arises from dividing by 0.02.

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