(a) Non-Probability Sampling
This method involves choosing items from the population without using a random sampling technique. Elements in the target population have an unknown chance of being selected into the sample. A non-probability sample is based on subjective judgement and is biased in the sense that some members of the target population have more chances of being selected than others. There are three main types of non-probability sampling: quota, judgement and convenience.
(b) Probability sampling
Probability sampling is a method of drawing a portion of a population so that each member of the target population has a known and non-zero chance of being selected into the sample. There are many ways in which a probability sample may be drawn from a population. Some of these ways are described below.
maurice.mutuku answered the question on October 3, 2019 at 09:25
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