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. The following table presents measured weights (in g), thicknesses (in mm), and loads (in kg) required to crack the specimen for a collection of specimens dated between A.D. 1100 and 1300 from the Middle Gila River, in Arizona.

a. Fit the model

b. Drop the variable whose coefficient has the larger P-value, and refit.

c. Plot the residuals versus the fitted values from the model in part (b). Are there any indications that the model is not appropriate?

ECON2020 MicroeconomicPrinciples Chapter1:TheScopeandMethodofEconomics Economics‐thestudyofhowindividualsandsocietieschoosetousethescareresources thatnatureandpreviousgenerationshaveprovided o Behavioralandsocialscience Whystudyeconomics o 1.Tolearnanewwayofthinking Opportunitycost‐thebestalternativethatisgivenupwhenachoiceordecisionis...