Introduction Ashton studied the effect of wearing single-strap and double-strap backpacks on shoulder muscle contraction.He tested the same subjects in both single-strap and double-strap conditions to control individual differences in trapezius muscle activity.This study employed a ____ design.
A)between-subjects
B)matched groups
C)multiple independent groups
D)within-subjects

Question

Quizplus · Accepted Answer

The study employed a within-subjects design because the same subjects were tested in both single-strap and double-strap conditions. This design allows for better control of individual differences in variables such as trapezius muscle activity.

Introduction Ashton Studied the Effect of Wearing Single-Strap and Double-Strap