In a study 28 adults with mild peridontal disease are assessed before and 6 months after implementation of a dental-education program intended to promote better oral hygiene. After 6 months, peidontal staus improved in 15 patients, declined in 8, and remained the same in 5.
9.4 Supose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using Wilcoxon rank-sum test, evaluate the significance of the results, assuming there are no ties.
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