The type of sampling ensures that bias is eliminated from the study because any systematized error is eliminated. This ensures that the results of the study could be considered to be valid and containing known error. Probability sampling methods utilize randomization in the selection of the sample elements. With a probability sampling method the researcher is aware of the probability of each member of the sample being chosen. In essence each member has the same probability of selection. There are times however where sampling is done without replacement and while each member does not have the same probability the difference is negligible so that it does not influence the study negatively. When a researcher uses non-probability sampling methods the researcher is unaware of the chance of selection of each member of the sample. Consequently the researcher...
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