Consider the results of a six-year observational study that documented health changes related to homeopathic care (Spence and Thompson 2005).

Homeopathic treatment was defined as “stimulating the body’s autoregulatory mechanisms using microdoses of toxins.” Every one of the 6544 patients in the study was assigned to a hospital outpatient unit for homeopathic treatment. Of these, 4627 patients (70.7%) reported positive health changes following treatment. Suggest a major improvement to the design of this study.