Plutonium has been produced in Hanford, Washington, since the 1940s, and some radioactive waste has leaked into the Columbia River. A 1965 study of cancer incidence in nearby communities [18] compared an exposure index and the cancer mortality rate per 100,000 residents for nine Oregon counties:

Which variable is the explanatory variable and which is the dependent variable?
Make a scatter diagram and describe the relationship as either positive, negative, or nonexistent.

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Exposure Index Cancer Mortality 8.34 210.3 6.41 177.9 3.41 3.83 2.57 129.9 162.3 130.1 11.64 1.25 2.49 207.5 113.5 147.1 1.62 137.5