Order effects can become a confounding variable because ____.
A) all the treatment conditions are affected equally
B) earlier conditions affect outcomes under later conditions
C) other time-related threats such as history become indistinguishable
D) individual differences between treatment conditions are created

Question

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Order effects occur when the order in which participants experience different treatments affects the outcome. This can become a confounding variable because the earlier conditions may influence or interact with later conditions, making it difficult to determine the true effect of the treatment. As a result, other time-related threats such as history become indistinguishable, and individual differences between treatment conditions are created.

Order Effects Can Become a Confounding Variable Because ____