Question

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 to 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. A Mann-Whitney U test was performed to assess whether there is a significant difference in self-reported improvement in pain, and the U test statistic=9. Should the null hypothesis be rejected or not? (enter 1 for “yes”, and 0 for “no”)

New Drug:                  4          5          3          3          4          2

Standard Drug:           2          3          4          1          2          3

Answer 1