Answered: To analyze the risk, or volatility,…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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To analyze the risk, or volatility, associated with investing in General Electric common
stock, a sample of the eight quarterly percent total returns was identified as shown below
(Charles Schwab website, January 2012). The percent total return includes the stock price
change plus the dividend payment for the quarter.
20.0 20.5 12.2 12.6 10.5 5.8 18.7 15.3
a. What is the value of the sample mean? What is its interpretation?
b. Compute the sample variance and sample standard deviation as measures of volatility
for the quarterly return for General Electric?
c. Construct a 95% confidence interval for the population variance?
d. Construct a 95% confidence interval for the population standard deviation?

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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