PSY-2150 Chapter 2: Chapter 2

• School: Vanderbilt University
• Department: Psychology (AS)
• Course: PSY-2150
• Professor: Sandberg Elisabeth

Document Summary

In a skewed distribution, the mean is usually farther out in the long tail than the median. Lines extend from the box out to the smallest and largest distributions. In a modified boxplot, suspected outliers are identified with a special plotting symbol such as an asterisk(*) [both measure how far the observations fall from their mean: **degrees of freedom (n-1, properties that determine the usefulness of the standard deviation: S measures variability about the mean and should be used only when the mean is chosen as the measure of center. S is always 0 or greater than 0; s=0 only when there is no variability (this happens only when the observations all have the same value) S has to be in the same units of measurement as the original observations. Like the mean, standard deviation is not resistant; a few outliers can make s very large.