Dr Duffy Conducted an Experiment to Raise I Which of the Following Can You Say About the Results

Dr. Duffy conducted an experiment to raise I.Q. scores by having experimental subjects eat three bananas a day for a month, while control groups had no bananas. Below are his results scores = average I.Q. score for group of subject) . $$\begin{array} { l l l } & \text { Pretest } & \text { Posttest } \\\hline \text { Experimental Group } & 102 & 110 \\\hline \text { Control Group } & 80 & 110\end{array}$$ Which of the following can you say about the results?

A) The experiment proves that the Dr. Duffy's treatment works.
B) The experiment has a statistical regression issue.
C) The experiment has history effects.
D) The experiment has selection bias problems.

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