MATH 1040 - Introduction to Statistics

Lesson 7.3 The Z-Score

Reading

Reading sections are from the Introductory Statistics Textbook

• 4.1.2 Standardizing with Z-scores (pages 142-143)

Lesson

The z-score is, essentially, the number of standard deviations a given value is from the mean.

We can easily go from the value to the z-score with the following equation:

\[z=\frac{x-\bar{x}}{s}\tag{Z-Score}\]