Harry Has Carried Out an Experiment and Inferential Statistics Show

Multiple Choice

Harry has carried out an experiment and inferential statistics show a significant difference between the experimental and the control group. Why couldn't Harry conclude that his findings were important ones?

A) He may have used an unrepresentative sample.
B) because the difference between groups may have been very small though significant.
C) A mistake may have been made in order of presentation of stimuli.
D) This positive correlation between groups does not imply causality.
E) This negative correlation between groups does not imply causality.