The article “Anatomical Factors Influencing Wood Specific Gravity of Slash Pines and the Implications for the Development of a High-Quality Pulpwood” (TAPPI, 1964: 401–404) reported the results of an experiment in which 20 specimens of slash pine wood were analyzed. A primary objective was to relate wood specific gravity (y) to various other wood characteristics. Consider the accompanying data (top of page 570) on y and the predictors 
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number of fibers/mm2 in springwood, 2 number of fibers/mm2 in summerwood, 3 springwood %, 4 % springwood light absorption, and 5 % summerwood light absorption. Based on the accompanying Minitab output, which model(s) would you recommend investigating in more detail?
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