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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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Confidence Intervals for the Mean with Large Samples

So let’s learn how to construct a confidence interval for a population mean using a large sample size. By a large sample size, we are generally referring to n ≥ 30. The first step in developing a confidence interval for a population involves the following discussion on estimators.

Estimators

The simplest estimate of a population is the point estimate, the most common being the sample mean. A point estimate is a single value that best describes the population of interest. Let me explain this concept by using the following example.
I think my wife has been kidnapped and secretly replaced by a Debbie look-alike who also happens to be completely addicted to the QVC home shopping channel. ...

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