Question

Andria is conducting an experiment to determine whether a new medication is effective in reducing swelling. She gets 1,000 volunteers with swelling and divides them into 2 groups. The control group does not receive any medication; the treatment group receives the medication. The patients in the treatment group show reduced signs of swelling. What can Andria conclude from this experiment?

Answer 1

Since only the treatment group showed reduced signs of swelling it is likely that the medication resulted in the reduced swelling assuming all other variables are equal between the treatment and control