Psychologists find that a high percentage of physically abused children become violent adults. This conclusion must be based on which type of study?

A) double-blind
B) single-blind
C) longitudinal
D) cross-sectional

Longitudinal Study

A research approach that involves repeated observations of the same variables over long periods, often decades, to detect patterns, changes, and possible predictions.

Double-Blind

An experimental procedure in which neither the subjects of the experiment nor the persons administering the experiment know the critical aspects of the experiment, to prevent bias.

Single-Blind

A study or experiment design where only the participants are unaware of which group (experimental or control) they belong to, preventing bias in their responses.