More Than One Independent Variable Ashton Studied the Effect of Backpack

question 3

Multiple Choice

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)

• A)higher-order interaction.
• B)interaction.
• C)main effect.
• D)two main effects.

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