A z-score shows how far away (expressed in units of standard deviations) from the mean—either above or below—a value is situated. Z-scores can help traders gauge the volatility of securities.

An Industry Example of Z-Score Let’s assume you are analyzing the sales performance of a team of salespeople. The mean sales of the group are $75,000, and the standard deviation is $10,000.

A z-test is a statistical test used to determine whether two population means are different when the variances are known and the sample size is large. Skip to content. News ...

Although it has the highest mean Z-score, the health care industry also has the most volatile Z-scores, with a standard deviation of 6.37. Additionally, the range of the Z-scores for medical ...

Z - Score depends on the mean and the standard deviation of raw marks. Z - score computed for a hypothetical mark of 65 is the highest ( more than 2 ) for Chemistry during 2002 - 2004. The lowest ...