# Statistic Concepts: Estimates and Confidence

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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#### Solution Preview

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.

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