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

Question

Quizplus · Accepted Answer

Selection bias is the only option that describes an extraneous variable caused by improper assignment of test units to treatment conditions. Statistical regression refers to the tendency of extreme scores to move towards the mean in subsequent measurements, while instrumentation refers to changes in the measurement tools or techniques.

________ Refers to an Extraneous Variable Attributable to the Improper