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| are measurments or observations that are gathered for an event under study |
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| is the branch of mathematics that involves collecting, organizing, summarizing, and presenting data and drawing general conclusions from data |
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| consists of all subjects under study |
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| is a representative subgroup or subset of the population |
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| each suject of the population must have an equal chance of being selected |
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| is taken by numbering each member of the population and then selecting every kth member, where k is a natural mumber |
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| where the population is divided into groups where the members of each group have similar characteristics(such as female freshmen, male freshmen, female sophomores, and male sophomores)and members of each group are selected at random |
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| when an intact group if subjects that represent the population is used for a sample |
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