Image of formula for calculation of variance

Definition:

The variance is an indication of how far each number in a sample is from the overall mean. It is calculated by working out the difference between each observation in the set and the mean, squaring the differences and dividing the sum of the squares by the number of values in the sample.

Resources:

 

Conversion marketing – Glossary of Conversion Marketing.

Over 300 tools reviewed – Digital Marketing Toolbox.

A/B testing software – Which A/B testing tools should you choose?

Types of A/B tests – How to optimise your website’s performance using A/B testing.

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