Sample, set of data collected and/or selected from a statistical population by a defined procedure., Population, the entire pool from which a statistical sample is drawn, Census, study of every unit, everyone or everything, in a population, Hypothesis, forming and testing a prediction, Questionnaire, a set of questions submitted to a sample, Interview, a face to face way of collecting data, Random, no pattern, Cluster, dividing the population into specific groups, Systematic, forming a pattern, Stratified, a true representation of the population.

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