Various statistical concepts are incorporated in Data Science. In this notebook I am going to cover some basic statistical terms, and talk about metrics used in Data Science for Regression tasks. This notebook can be also viewed on Github.

#### 1. Statistical terms

Let’s look at some simple statistical terms in detail:

**Mean ():** Averaging. Mean is a sum of all values divided by the number of values:

**Variance ():** Describes the spread of a distribution. For a set of values, the variance:

**Standard Deviation ():** Square root of variance, is in the units of the data it represents: