Use the Following Information for Following Questions

Multiple Choice

Use the following information for following questions:
A group of 500 patients who suffer from hypothyroidism, a condition in which your thyroid does
not produce enough of certain hormones, were asked to participate in a study to determine
the effectiveness of a new medication. The patients were randomly divided into two groups,
one that was given the actual medication, and one that received a placebo pill. The results of
the study are below.
-Can we conclude that the improved symptoms were caused by the new medication?

A) Yes, this is a controlled experiment.Since a higher percent of patients who took the medication had improved symptoms, we can conclude causation.
B) Yes, this is a controlled experiment.We can always conclude causation with a controlled experiment.
C) No, even though this is a controlled experiment, there was no difference between the treatment and control groups, so we cannot conclude causation.
D) No, even though this is a controlled experiment, there might be a confounding factor since the placebo group had improved symptoms too.