Many appliances such as televisions and electronic gadgets such as cell phones contain rare Earth metals. The scatter- plot and the model in Fig. 61 compare the annual revenue (in billions of dollars) of U.S. electronics and appliance stores with annual worldwide rare Earth mining (in thousands of metric tons).

a. Is the association positive, negative, or neither? What does that mean in this situation?
b. Estimate the rate of change of annual worldwide rare Earth mining with respect to annual revenue of U.S. electronics and appliance stores.

Transcribed Image Text:

Annual Revenue versus Annual Mining 140 120 E 100 격 80 60 40 40 50 60 70 80 0 100 0 120 Annual revenue (billions of dollars)