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Computing Confidence Intervals Concept

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Don't quite understand the concept of computing confidence intervals. How would confidence intervals determine sampling design and data collection for information gathered.

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An attached Word document explains why confidence intervals are important in conjunction with sampling design and data collection.

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Confidence Intervals are used to state with a given (or assumed) level of confidence, the upper and lower limits between which the population parameter would lie. Confidence intervals can be used for ascertaining population mean, standard deviation, variance, and proportion. For example, if ...

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