Sampling methodology

Sampling is the process of the selection of data from a population. By analyzing the selected samples, characteristics of the full population can be concluded. Sampling is performed when it is not feasible to study the full population due to time and cost constraints. Samples are a subset of the population.

Sampling types

This is a very important topic for the CISA exam perspective. Two to three questions can be expected from this topic. A CISA candidate should have an understanding of the sampling techniques mentioned here:

Sampling Types	Description
Statistical sampling	This is an objective sampling technique. Also known as non-judgmental sampling. It uses the laws of probability, where each unit has an equal chance of selection. In statistical sampling, the probability of error can be objectively quantified, and hence the detection risk can be reduced.
Non-statistical sampling	This is a subjective sampling technique. Also known as judgmental sampling...