Term	Achieved Sample
Synonym
Related Term
Source of Definition
Short Definition
Statistical Activity	Survey design

Definition
In a randomised design, the selected sample is what we are interested in getting an estimate from. If there is non-response (which there generally is) then 2 problems arise 1. any difference between respondents and non-respondents can lead to bias.

2. the sample size is smaller and thus the sampling error is greater.

Example
If we select a sample of 50 people and only 40 people respond, the achieved sample consists of the 40 respondents.