A researcher is studying the effects of caffeine on sleeplessness (measured as the amount of time spent awake in a 24 hour period). A group of participants are randomly assigned to one of three groups (no caffeine, low caffeine, high caffeine). What type of general design classification is this?
A) Between-groups design
B) Within-subjects design
C) Mixed design
D) Associational design

Question

Quizplus · Accepted Answer

This study involves random assignment of participants to different groups, which suggests a between-groups design. The independent variable (caffeine level) is manipulated between groups.

A Researcher Is Studying the Effects of Caffeine on Sleeplessness