1.2 Types of Variables
Definition: measure a quality or characteristic on each experimental unit.
Examples: Eye color, state of residence, gender, degree objective (BS/BA, MA, MBA, Ph.D.)
Definition: measure a numerical quantity or amount on each experimental unit.
Examples: Height, weight, systolic blood pressure, number of weeds/square meter in a wheat field, number of defective items in a carton of 20
Qualitative variables produce data that can be categorized according to similarities or differences in kind; they are often called , e.g., eye color, state of residence.
©1998 Brooks/Cole Publishing/ITP