Course Content

The Art of A/B Testing

## The Art of A/B Testing

# About Normality

Previously, we conducted a successful **A/A testing**. To properly conduct **A/B testing**, we need to know how our data is distributed.

There are many types of distribution in statistics, but the most recognizable type is the **Gaussian distribution** (**normal distribution**). In nature, many things are normally distributed.

IQ distribution at Kyiv Polytechnic Institute according to test results in 2020:

Weight distribution among male in the Bruges in 2019:

But there are events to which the normal distribution is alien. The time between emails:

The average number of customers per hour:

Different types of tests are used for different distributions. In this section, we will focus on the __ normal__ distribution and how to test for normality.

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