Statistics Definitions > Finite and Infinite Statistics

## Finite and Infinite Statistics

## 1. Finite Statistics

**Finite statistics** are statistics calculated from finite sets. Basically, you have a sample that you’re using to make a calculation (like the sample variance). If you have a countable number of data points in your sample, what you end up with is a finite statistic.

## 2. Infinite Statistics

On the other hand, **infinite statistics** are those calculated from infinite sets. For example, a probability density function has, for practical purposes, an infinite number of data points under its curve.

## Finite and Infinite Statistics Examples

The normal distribution is one example of an area that uses infinite statistics: the z-table on this site lists just a few hundred points, but technically the table has an uncountable number of points on it (e.g. z=2.1 is listed, but z = 2.1249865 is not). This is for a couple of reasons:

**Space**: there simply isn’t room on any page in existence for a table of infinite values!**Practical Purposes:**Even if you could list every possible z-value, there comes a point where the values are so similar, a finite set is “good enough”. Take a look at this snapshot from the table:

Any value between 3.7 and 3.8 would also be an area of 0.4999, so there’s really no point in listing them all.

**Need help with a homework or test question? **With Chegg Study, you can get step-by-step solutions to your questions from an expert in the field. Your first 30 minutes with a Chegg tutor is free!

*Statistical concepts explained visually* - Includes many concepts such as sample size, hypothesis tests, or logistic regression, explained by Stephanie Glen, founder of StatisticsHowTo.

**Comments? Need to post a correction?** Please post a comment on our *Facebook page*.