Statistics is a branch of mathematics that deals with the study of various techniques used for the collection, organization, analysis and interpretation of data. After the interpretation of data, a final report is written that is comprised of data, results and final decisions.

Statistics is only concerned with large amount of data. Therefore, we neglect and do not consider individual ones. For example in case of bricks, statistics is only concerned with a behavior of the group of bricks. It has no concern with every individual brick.

Statistics makes clusters of all the different types of bricks and places the resembling bricks in the same clusters. After finalizing the groups of bricks based on properties, now a result will be presented and that result will be different for different groups, but the particular result will be same for all bricks that will come in that group.

Statistics only deals with those things, whose numerical description is possible by using any means. Numerical work can be done by counting or by measuring. For example in case of wind, numerical description is not possible. Therefore, in statistics we cannot consider it.

If two different methods are used for the analysis of the same group of data, then uncertainty (chance of variation, deficiencies) may arise in results.

### Example

If you want to find the mean of a certain given data, then there are two ways through which you can find the mean.

- Un-grouped arithmetic mean
- Grouped arithmetic mean

After evaluating the result by using both methods, there will be an uncertainty in both results.

## Branches of statistics

Statistics is divided into two branches, depending on the procedure used for the analysis.

- Descriptive statistics
- Inferential statistics