lzheimer's disease is a progressive disease of the brain. An article published in 2006 was critical of the methodology used in studies of Alzheimer's treatments conducted prior to 2006. In a random sample of n=30 Alzheimer's studies, the quality of the methodology was measured on the Wong scale with scores ranging from 9 (low quality) to 27 (high quality) for each study. The data is provided below. Copy and paste the following data into your R/RStudio console: x=c(26,16,17,16,10,27,21,10,11,10,20,17,23,17,20,13,17,21,25,15,23,19,19,18,23,26,11,18,21,20); (a) Find a 84% confidence interval for the mean quality of studies on the treatment of Alzheimer's disease. Assume that the data is normally distributed.

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use as many digits as R gives you (b) Correctly complete the interpretation of the 84% confidence interval you computed in (a) : ? Based on this sample All studies For all persons with Alzheimer's disease , the mean quality of ? all Alzheimer's studies all Alzheimer's studies conducted prior to 2006 all Alzheimer's patients is somewhere between

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and

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on the Wong scale.