PSY 411 Chapter 4 Notes

**percentile rank**

A score that indicates the percentage of people who scored at or below a given raw score

**standard normal distribution**

A normal distribution with a mean of 0 and a standard deviation of 1

**z score (standard score)**

the number of standard deviations an individual score is from the mean

**Standardization**

The process of putting different variables on the same scale to compare them. to standardize variables, you calculate the mean and standard deviation.

**Understand the unique properties of the normal curve and we can use the normal distribution as a tool**

Symmetrical, bell-shaped frequency polygon,  normal distribution  mean = median = mode

**Describe what a percentile rank is** 

A score that indicates the percentage of people who scored at or below a given raw score