The following data on distilled alcohol content (%) for a sample of 35 port wines was extracted from the article "A Method for the Estimation of Alcohol in Fortified Wines Using Hydrometer Baume and Refractometer Brix" (Amer. J. Enol Vitic., 2006: 486-490). Each value is an average of two duplicate measurements. 16.35 18.85 16.20 17.75 19.58 17.73 22.75 23.78 23.25 19.08 19.62 19.20 20.05 17.85 19.17 19.48 20.00 19.97 17.48 17.15 19.07 19.90 18.68 18.82 19.03 19.45 19.37 19.20 18.00 19.60 19.33 21.22 19.50 15.30 22.25 Draw box whisker plot

a. Determine the medians, fourths, and fourth spreads for the two samples.
b. Are there any outliers in either sample? Any extreme outliers?
c. Construct a comparative boxplot, and use it as a basis for comparing and contrasting the ED and non-ED samples.