Module 4 Summary

 

In this module you discovered mean, median, mode, outliers, trimmed mean, weighted mean, choosing a measure of central tendency, and percentile rank. Some of the key points of this module are outlined in the following table.

 

arithmetic mean	the sum of the set of values divided by the number of values
median	the midpoint of an ordered data set; half the values are higher and half are lower
mode	the value that occurs most often in the data set
trimmed mean	the mean calculated by disregarding an equal number of data points from both ends of the data set
weighted mean	the mean calculated when certain values are worth more than others
percentile rank	the percentage of values in a data set that are lower than a given value

 

Not all of these ideas come up at the same time when interpreting and analyzing data. It’s important to understand these ideas so that when they do appear, you can recall prior knowledge to help you make an informed decision.