Probability Sample Methods

Multistage Sample

In Multistage Sampling, surveyors combine two or more sampling methods.

Let's go back to the example of the elementary school conducting a survey on what students want included on the school lunch menu. 

Stage 1: Cluster Sampling - students are divided into clusters by grade level, some clusters are randomly selected to participate in the survey.

Stage 2: Systematic Random Sampling - instead of surveying all students in the selected clusters, we decide to pick a systematic random sampling by listing all members of each cluster on a paper and selecting every 10th student to participate in the survey.