The amount of municipal solid waste created has become a major problem. According to the Environmental Protection Agency, the yearly amounts (millions of tons) are:

(a) Plot the amount of garbage (millions of tons) versus year.
(b) Visually, does there appear to be a strong correlation? Explain.
(c) Give one possible lurking variable.

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ear 1960 1970 1980 1990 2000 2010 Garbage 88 121 152208 243 250 millions of tons) Population 179 203 227 249 282 309 millions)