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Definition: A sample is a subset of measurements selected from the population of interest.

Example: Select n 20 volunteers for a medical study taken from the population of a given city. See Example 1.1 for an example of experimental unit, variables, sample, and population.

Definition: Univariate data result when a single variable is measured on a single experimental unit, e.g., record a person’s height.

Definition: Bivariate data result when two variables are measured on a single experimental unit,e.g., record a person’s height and weight.

Multivariate data result when more than two variables are measured, e.g., record a person’s height, weight, gender, and age.

©1998 Brooks/Cole Publishing/ITP

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