In order for a survey to accurately generalize the entire population, the survey MUST select participants in a RANDOM mode, and sampled individuals must have an EQUAL LIKELIHOOD of being chosen.
Random sampling refers to the sampling methodology by which each item or element of the target population exhibits the same probability of being included in the sample.
Random sampling represents the most reliable methodology of probability sampling.
Because samples are selected in a random mode, any research using a random sampling approach has high internal and external validity.
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