In systemic sampling, we select some starting point and then select every kth (such as the 50th) element in the population. Per Elementary Statistics by Triola, page 24
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Random sampling is picking a subject at random. Systematic sampling is using a pattern to pick subjects, I.e. picking every third person.
efficiency
Answer is Quota sampling. Its one of the method of non-probability sampling.
Sampling error leads to random error. Sampling bias leads to systematic error.
Systematic sampling occurs when you have a list of people, then you select every 10th person on the list. No bias will occur as long as the order of the people on the list is not important.