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Market Research Definitions

Z-Test:
A statistical test used in inference determining if the difference between a sample mean and the population mean is large enough to be statistically significant. Z-Test reliability requires knowing the population mean, population standard deviation and there must be a simple random sample.

ZIP Code:
The United State Postal Service assigns regions or mailing districts with a Zone Improvement Plan (ZIP) code. A standard ZIP code contains 5 digits (i.e. 98040), or a combination of 5 digits – 4 digits (i.e. 98040-4545).

ZIP Code Demographics:
Provides statistics and characteristics of a population located within a designated ZIP code. Age, sex, race and total population size are just a few attributes a ZIP code demographic analysis can provide.