Question 4 (18 points) A pharmaceutical company tested three formulations of a pain relief medicine for migraine headache sufferers. For the experiment, 27 volunteers were selected and 9 were assigned to one of three drug formulations. The subjects were instructed to take the drug during their next migraine headache episode and to report their pain on a scale of 1=no pain to 10= extreme pain. The data are given below: Drug A Drug B Drug C 4 6 5 G H 4 4 5 3 8 4 6 5 Evaluate whether the drug formulations have a significant effect on mean pain level reported. Provide an assessment of the validity of your results and plain language interpretations. Also, determine which drugs differ in terms of mean pain reported and if applicable provide a ranking of the drugs in terms of their ability to reduce pain