Below contains dbh (cm), basal area (ba, m^-2), and total dry weight (kg) for 29 TT spruce trees. Please develop the best model to summarize the relationship between tree size and weight. Final model have to meets all the linear model assumptions. (Do in R, including the graphics)

 

id 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15. 16 17 18 19 20 21 22 23 24 25 26 27 28 29 dbh ba 21 16 17 20 15 14 11. 24 9 23 40 43 20 15 9 10 31 18 0.035 0.02 0.023 0.031 0.018 0.015 0.01 0.045 0.006 0.042 0.126 0.145 0.031 0.018 0.006 0.008 0.075 0.025 13 0.013 24 0.045 9 0.006 17 0.023 4 0.001 26 0.053 33 0.086 20 0.031 17 0.023 21 0.035 20 0.031 totwt 92.74 54.48 98.48 113.51 44.92 44.76 14.99 169.78 41.08 112.39 381.12 383.19 252.96 54.56 14.4 18.98 349.83 95.15 20.67 165.18 20.27 59.83 1.96 188.57 279.81 84.59 61.18 125.89 105.18