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    Statistic Concepts: Estimates and Confidence

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    Part A: Define (a) point estimate, (b) interval estimate, (c) confidence interval, and (d) confidence level.

    Part B: List some common confidence levels. Why not use other confidence levels? Explain.

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    Part A: Definition
    (a) Point Estimate:
    The outcomes (e.g. mean, weighted difference, odds ratio, relative risk or risk difference) obtained in a sample which are used as the best estimate which is true for the related population from which the sample is taken.
    It is desirable for a point estimate to be:
    (1) Consistent: The bigger the sample size, the more precise the estimate.
    (2) Unbiased: The expectation of the observed values of ...

    Solution Summary

    The concepts of point estimate, interval estimate, and confidence levels are defined.