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Week 2 Practice Worksheet PSY/315 Version 8 1 Week 2 Practice Worksheet Cruz University of Phoenix PSY/315 Dr. Nancy Walker July 19, 2021 Copyright ©2013 by Pearson Education, Inc. All rights reserved. Used with permission.
Week 2 Practice Worksheet PSY/315 Version 8 2 University of Phoenix Material Week 2 Practice Worksheet Provide a response to the following prompts. 1. The Wilcox & Keselman (2003) article from this week’s electronic readings discusses two problems with measures of central tendency: skewness of the data and outliers. Discuss each of these issues and how they affect measures of central tendency. Skewness occurs when there is an asymmetrical distribution, which differs from a common assumption of a symmetrical normal distribution of a real valued variable about its mean. Skewness in the data moves these measures from the center. Without skewness, the mean or the median (two of the main measures of central tendency) can be found in the center of the distribution. The mean and the median may not move by the same amount. Outliers occur when some data are well outside of what one would expect. The median is not affected as much by outliers and skewed data as the mean, and is typically the favored measure of central tendency when the distribution is not symmetrical. The mean includes every value in the distribution, and is influenced by outliers and skewed distributions. When a distribution is skewed, the mode remains the most common occurring value, the median remains the measure of central tendency, and is a single value that tries to describe the data by identifying the central position within that set of data.

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