What Are Negative Z Scores?
Last Updated Mar 27, 2020 11:18:47 AM ET
A negative Z score indicates that a value is below the mean for the group of values. Z scores show how far away a particular score is from the group mean using standard deviations.
For example, a Z score of -1 shows that the value is one standard deviation below the group mean value. If data are normally distributed, 95 percent of Z scores will fall between -2 and 2 and are considered typical values that represent the sample well. Z scores help statisticians more quickly assess whether a score is typical and aid in the comparison of individual scores from different groups of data. Z scores are also called standardized scores.
More From Reference

10 Must-Watch TED Talks That Have the Power to Change Your Life

Strange Americana: Does Video Footage of Bigfoot Really Exist?

How the COVID-19 Pandemic Will Change In-Person Retail Shopping in Lasting Ways

Tips and Tricks for Making Driveway Snow Removal Easier

Here’s How Online Games Like Prodigy Are Revolutionizing Education

What Are the Steps of Presidential Impeachment?