For a formal experiment to yield valid results, all alternative explanations for the findings must be ruled out by a process of
A. experimental control.
B. placebo effectiveness.
C. nonrandom assignment.
D. interactive subjectivity.
Answer:A
For a formal experiment to yield valid results, all alternative explanations for the findings must be ruled out by a process of
A. experimental control. B. placebo effectiveness. C. nonrandom assignment. D. interactive subjectivity.