18 A small pilot study is run to compare a new drug for chro

18. A small pilot study is run to compare a new drug for chronic pain to one that is currently available. Participants are randomly assigned to receive either the new drug or the currently available drug, and report improvement in pain on a 5-point ordinal scale: 1=Pain is much worse, 2=Pain is slightly worse, 3= No change, 4=Pain improved slightly, 5=Pain much improved. Is there a significant difference in self-reported improvement in pain? Use the Mann-Whitney U test with a 5 percent level of significance. New Drug: 4 5 3 3 4 2 Standard Drug: 2 3 4 1 2 3

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