Non-random sampling bias could occur if each individual in the source population does not have an equal chance of being selected for the sample population.
What is a sample population?
The process of selecting the sample from the population is known as the sample population. Sample refers to the group of people in a population. It is a specific group that you will collect the data from. The sample size is always less than the total size of the population. It is very easier and it has an effective cost to process the smaller subset of the population rather than the entire group. The sample mean and sample population can be obtained from the sample. It is a statistical method used to calculate the sample mean from the sample population. Let us have a simple example,
people living in America are the sample of the population. It is used in testing when the population size is too large for all the members or observations to be included in the test.
learn more about of population here
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