Marketing Research Glossary - XYZ

X Axis: The horizontal axis on a graph.

Y Axis: The vertical axis on a graph.

Zip +4: Designation by the U.S. Postal Service for the nine-digit coding structure.

Zip Code: Registered trademark of the U.S. Postal Service; a five-digit or nine-digit code identifying regions in the United States.

Zip Code Demographics: The demographic characteristics of a population living in a particular zip code.

Z-Test: A hypothesis test (for samples from populations with known variance, or for large samples from populations with unknown variance) based on the standard normal distribution, about a difference between a single mean and a known or theoretical population mean, or about differences between the means of two samples.

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