________ refers to an extraneous variable attributable to the improper assignment of test units to treatment conditions.
A)Instrumentation
B)Statistical regression
C)Selection bias
D)None of the above

Question

Quizplus · Accepted Answer

Selection bias refers to the improper assignment of test units to treatment conditions, leading to extraneous variables that can affect the results of the study. Instrumentation refers to changes in the measurement instrument or observation technique that can affect the results, while statistical regression refers to the tendency for extreme values to move closer to the mean in subsequent measurement periods. None of these options fully capture the concept described in the question.

________ Refers to an Extraneous Variable Attributable to the Improper