The article "The Ball-on-Three-Ball Test for Tensile Strength: Refined Methodology and Results for Three Hohokam Ceramic Types" (M. Beck, American Antiquity, 2002:558-569) discusses the strength of ancient ceramics. Several specimens of each of three types of ceramic were tested. The loads (in kg) required to crack the specimens are as follows:

a. Construct comparative box plots for the three samples.
b. How many outliers does each sample contain?
c. Comment on the features of the three samples

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Ceramic Type Loads (kg) Sacaton 15, 30, 51, 20, 17, 19. 20, 32, 17, 15, 23, 19, 15, 18, 16, 22, 29, 15, 13, 15 27, 18, 28, 25, 55, 21, 18, 34, 23, 30, 20, 30, 31,25, 28, 26, 17, 19, 16, 24, 19, 9, 31, 19, 27, 20, 43, 15 20, 16, 20, 36, 27, 35, 66, 15, 18, 24, 21, 30, 20, 24. 23, 21, 13, 21 Gila Plain Casa Grande