Sample sizes are used in studies to determine larger connotations with a wider demographic through considering the small sample size as being representative of the wider pool. There can be several sample sizes involved in every stream, such as whether they have purchased from a certain website before or whether they are repeat customers. Sample sizes can be picked in different ways including through experience, which is information readily available from past collections. It could also be through the use of a target variance or through using a target to power a statistical test. It could also use a confidence level to determine the accuracy of the results.