Primary data - information collected by someone first hand, Secondary data - existing information that was collected by someone else, Population - the entire group of people/items being studied, A sample - any part of the population, Census - a survey of the entire population, Random sampling technique - ensures that all members of a population are equally likely to be selected to be part of a sample, Simple random sample - when a numbers of members of the population are chosen at random with no real strategy, Systematic random sample - when a number of members of the population are selected on fixed intervals Ex. every 5th name on a list, Stratified random sample - when a population is divided into groups, and then a portion of each group is selected, Non-random sample - a sample that is NOT representative of the whole population, Sampling bias - creates results that cannot be generalized, making data unreliable or only relevant for a specific group of people,

Data Management Vocabulary

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