Sampling methods Essay

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Sampling methods are classified as either probability or nonprobability. In probability samples, each member of the population has a known non-zero probability of being selected.

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Sampling error is the degree to which a sample might differ from the population. When inferring to the population, results are reported plus or minus the sampling error.

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b) estimates of the population parameters may be wanted for each sub-population; . c) increased accuracy at given cost.

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