Answered: Karl Pearson developed a measure that…

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

Karl Pearson developed a measure that describes the skewness of a distribution, called the coefficient of skewness. The formula is Skewness = 3 (mean-median)/standard deviation.

The value of this measure generally lies between -3 and +3. The closer the value lies to -3, the more the distribution is skewed left. The closer the value lies to +3, the more the distribution is skewed right. A value close to 0 indicates a symmetric distribution. Find the coefficient of skewness of the following distributions and comment on the skewness.

Compute the coefficient of skewness for the data in Problem 25

Problem 25 data: The following data (see photo) represent the weights (in grams) of random sample of 50 M&M plain candies.

0.87
0.88
0.82
0.90
0.90
0.84
0.84
0.91
0.94
0.86
0,86
0.86
0,88
0.87
0.89
0.91
0.86
0.87
0.93
0.88
0.83
0.95
0.87
0.93
0.91
0.85
0.91
0.91
0.86
0.89
0.87
0.84
0.88
0.88
0.89
0.79
0.82
0.83
0.90
0.88
0.84
0.93
0.81
0.90
0.88
0.92
0.85
0.84
0.84
0.86
Source: Michael Sullivan.

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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