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Statistics 270

# Statistics 270 - Statistics 270 Overview Study sections 1.1...

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Statistics 270 Overview : We are interested in drawing conclusions about the characteristics of a population from those of a well chosen subset of the population (a sample). Population The numerical characteristics of a population are referred to as parameters and the numerical characteristics of a sample are referred to as statistics . Sample Statistics are used as estimates of the parameters. These estimates will only be of value if the sample is representative of the entire population. Even if the sample is representative, the statistics obtained will almost always contain some sampling error. (e.g. the sample mean value is only an estimate of the population mean value.) Probability theory is the mathematical tool used to study this error. The general procedure for obtaining useful information about a population has three stages: 1. The Design Stage : A survey or controlled experiment is designed that should produce a representative sample from the population under study. 2.

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Statistics 270 - Statistics 270 Overview Study sections 1.1...

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