The success of sustainable harvesting of timber depends on how fast trees grow, and one way to measure a tree’s growth rate is to find the relationship between its diameter and its age. If you know this relationship and the relationship between the age and height of a tree, then you can estimate the growth rate for total volume of timber. Displays 3.103 through 3.106 give data on the age (in years) and diameters (in inches at chest height) of a sample of oak trees, a scatterplot of diameter versus age, a residual plot, and numerical summaries in the form of computer output. Based on these data, find a good model for predicting tree diameter from age

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