You Conduct an Experiment on the Effect of Low and High

Multiple Choice

You conduct an experiment on the effect of low and high anxiety on test performance.The results turn out nonsignificant.Now you don't know if anxiety truly has no effect on performance or whether you had faulty procedures.How could this have been avoided? You could have conducted a(n)

A) ethics evaluation.
B) manipulation check.
C) factorial study using better controls.
D) double-blind study.