Math Problem Statement

Consider a stock that has a standard deviation of 19.5% and the correlation with the market is 0.58. The standard deviation of the market is 12.9%. What is the beta of the stock? Enter your answer rounded to 2 DECIMAL PLACES.

Solution

To find the beta of the stock, we can use the formula for beta:

β=Covariance of the stock and the marketVariance of the market\beta = \frac{\text{Covariance of the stock and the market}}{\text{Variance of the market}}

This formula can be rewritten using the correlation coefficient as:

β=Correlation of the stock and the market×Standard deviation of the stockStandard deviation of the market\beta = \text{Correlation of the stock and the market} \times \frac{\text{Standard deviation of the stock}}{\text{Standard deviation of the market}}

Given data:

  • Standard deviation of the stock = 19.5% = 0.195
  • Correlation between the stock and the market = 0.58
  • Standard deviation of the market = 12.9% = 0.129

Substituting the values into the formula:

β=0.58×0.1950.129\beta = 0.58 \times \frac{0.195}{0.129}

Now, calculating the value:

β=0.58×1.51160.876\beta = 0.58 \times 1.5116 \approx 0.876

Therefore, the beta of the stock is approximately 0.88.

Would you like further details or have any other questions? Here are some related questions:

  1. How is beta interpreted in investment theory?
  2. What does a beta of 0.88 indicate about the stock’s relationship with the market?
  3. How does the correlation between a stock and the market influence the beta?
  4. What happens to a stock’s beta if the correlation with the market increases?
  5. How do standard deviations of stock and market affect the calculation of beta?

Tip: A higher beta indicates more volatility compared to the market, while a lower beta suggests the stock is less volatile than the market.

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Math Problem Analysis

Mathematical Concepts

Statistics
Financial Mathematics
Correlation
Standard Deviation
Beta Calculation

Formulas

\beta = \text{Correlation of the stock and the market} \times \frac{\text{Standard deviation of the stock}}{\text{Standard deviation of the market}}

Theorems

Beta of a stock as a measure of its volatility relative to the market

Suitable Grade Level

Grades 11-12