A forester would like to know how big a maple tree might be at age 50 years.She gathers data from some trees that have been cut down,and plots the diameters (in inches)of the trees against their ages (in years).First she makes a linear model.The scatterplot and residuals plot are shown.Describe the association shown in the scatterplot. 
Definitions:
Straight-Line Method
A depreciation technique where an asset's cost is reduced equally over its useful life.
Effective Interest Method
A technique used in accounting to allocate loan discounts or premiums over the life of the loan to the periods benefiting from the loan, reflecting a constant rate of interest.
Carrying Amount
The book value of an asset or liability; for assets, it is typically based on original cost less depreciation.
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