More Than One Independent Variable Ashton studied the effect of backpack design and load on shoulder muscle contraction.If one design produced greater muscle contraction at a heavier load than a lighter one, this illustrates a(n)

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Quizplus · Accepted Answer

The fact that the design of the backpack and the weight of the load interact to affect shoulder muscle contraction suggests an interaction between two independent variables. This is not a simple case of two main effects (each independent variable affecting the dependent variable independently), nor is it a higher-order interaction (involving three or more independent variables).

More Than One Independent Variable Ashton Studied the Effect of Backpack