Miguel Decides to Study the Relationship Between Exercise and Health

Multiple Choice

Miguel decides to study the relationship between exercise and health. He picks a group of older people, assesses how much they work out, and then relates these scores to measures of blood pressure and other signs of illness. Miguel's strategy of relating variables as they naturally occur is called:

A) correlational research.
B) naturalistic observation.
C) self-report.
D) experimental research.