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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