Sampling Designs and Evaluability Assessments

Identify and discuss 2 types sampling designs, their benefits and limitations

In essence, non-probability sampling and probability sampling are the only two types of sampling designs.

Non-probability sampling:

A researcher selects a small proportion of the units to represent the whole. The selection is deliberate without any defined procedure. For example, if the objective of the researcher is to study the economic conditions of a particular population residing in a defined area. The researcher deliberately chooses a few towns or cities to represent the entire area under study (Levy & Lemeshow, 2008). Based on the objectives and specificity of the study, the following are some of the sampling techniques under the non-probability sampling.

Purposive or Judgmental Sample

In purposive or judgmental sampling, the researcher selects the sample based on the familiarity of the population and the objectives of the study. The researcher prefers using a...
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