Sample size

Sample size is a term used in market research for defining the number of subjects included in a sample. By sample, we understand a group of subjects that is selected from the general population and is considered a representative of the true population for that specific study.

For example, if we want to predict how the population in a specific age group will react to a new product, we can first test it on a sample, that is representative for the targeted population. The sample size, in this case, will be given by the number of people in that age group that will be surveyed.