It is easy to measure the diameter at breast height (in centimeters) of a tree. It’s hard to measure the total aboveground biomass (in kilograms) of a tree, because to do this, you must cut and weigh the tree. The biomass is important for studies of ecology, so ecologists commonly estimate it using a power model. The following figure is a scatterplot of the natural logarithm of biomass against the natural logarithm of diameter at breast height (DBH) for 378 trees in tropical rain forests. The least-squares regression line for the transformed data is

Use this model to estimate the biomass of a tropical tree 30 cm in diameter.

Transcribed Image Text:

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