________ 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 bias that occurs when participants are not randomly assigned to different groups. This can result in systematic differences between the groups, making it difficult to draw conclusions about the effect of the treatment on the outcome. Instrumentation refers to changes in the measuring instrument or measurement procedures over time, while statistical regression refers to the tendency for extreme scores on a variable to become less extreme on a subsequent measurement.

________ Refers to an Extraneous Variable Attributable to the Improper