Answered: Let the random variable X represent…

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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Question

Let the random variable X represent the number of people living in a household in a certain town. The
standard deviation of X is 1.8. Which of the following statements is the best interpretation of the standard
deviation?

WHAT IS THE CORRECT ANSWER?

A. The number of people living in a randomly selected household is expected to be 1.8 people.

B. The number of people living in a randomly selected household will be 1.8 people away from the mean.

C. On average, the number of people living in a household varies from the mean by about 1.8 people.

D. For a random sample of households, the average number of people per household is expected to be 1.8
people.

E. For a random sample of households, the average number of people per household will be 1.8 people away
from the mean.

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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