Michelle Conducts an Experiment on the Effect of Low and High

Multiple Choice

Michelle conducts an experiment on the effect of low and high anxiety on test performance. The results achieved are nonsignificant. She does not know if anxiety truly has no effect on performance or whether she had conducted faulty procedures. How could this ambiguity be avoided?

A) By conducting an ethics evaluation
B) By checking the external validity of the variables
C) By factorial study using better controls
D) By conducting a manipulation check