Question: Suppose a dose-response function has been estimated to be R = 0.2 + 1.6D, where D is emissions of sulfur dioxide in parts per million

Suppose a dose-response function has been estimated to be R = −0.2 + 1.6D, where D is emissions of sulfur dioxide in parts per million (ppm), and R is the response measured as percent of agricultural crop decline. Determine if there is a threshold, and if so, what is the threshold? If there is none, explain how you know.

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