Scoliosis is a condition involving curvature of the spine. In a study, 286 girls age 10 to 15 years, were followed to determine the effects of an underarm plastic brace (111 patients), nighttime surface electrical stimulation (46 patients) and observation only (129 patients). A treatment was deemed to have failed if the curvature of the spine increased by 6° on two successive examinations. The preceding table summarizes the results obtained by researchers. At the 1% significance level, does the data provide sufficient evidence to conclude that a difference in failure rate exists among the three types of treatments? Use the Chi-Square Homogeneity Test and interpret your result.   Success Failure Total Brace 94 17 111 Stimulation 24 22 46 Observation 71 58 129 Total 189 97 286

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