Question: In a study reported in the September 24, 2007, issue of the Archives of Internal Medicine, German researchers described a study conducted on 1162 German

In a study reported in the September 24, 2007, issue of theArchives of Internal Medicine,German researchers described a study conducted on 1162 German adults suffering from chronic low-back pain. These subjects were randomly assigned to one of three groups: real acupuncture, sham acupuncture, and conventional therapy. Researchers found that 47% of subjects in the real acupuncture group improved, compared to 44% in the sham acupuncture group and 27% in the conventional therapy group.

a. Identify the observational units in the study.

b. Is this study an observational study or an experiment?

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