*27*

A

**z-score**tells you how many standard deviations away an individual data value falls from the mean. It is calculated as:**z-score**= (x – μ) / σ

where:

- x: individual data value
- μ: population mean
- σ: population standard deviation

This calculator allows you to compare the relative standing of two data points using their z-scores. Simply fill in the boxes below and then click the “Calculate” button.

z-score of first value = (19–15) / 4.2 = **0.9524**

z-score of second value = (17–14) / 2.6 = **1.1538**