42 Studies on treating Alzheimer’s disease. Alzheimer’s disease is a progressive disease of the brain. Much research has been conducted on how to treat Alzheimer’s. The journal eCAM (November 2006) published an article that critiqued the quality of the methodology used in studies on Alzheimer treatment. For each in a sample of 13 studies, the quality of the methodology was measured on the Wong scale, with scores ranging from 9 (low quality) to 27

(high quality). The data are shown in the table and saved in the TREATAD file. Estimate, with a 99% confidence interval, the mean quality m of all studies on the treatment of Alzheimer’s disease. Interpret the result.

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Data for Exercise 42 22 21 18 19 20 15 19 20 15 20 17 20 21 Based on Chiappelli, F., et al. "Evidence-based research in comple- mentary and alternative medicine III: Treatment of patients with Alzheimer's disease." eCAM, Vol. 3, No. 4, Nov. 2006 (Table 1).