Refer to the data on garbage in Exercise 3.31.
(a) Replace year by (year - 1960). Calculate the correlation coefficient between (year - 1960) and amount of garbage in millions of tons.
(b) Based on your calculation in part (a), what is the correlation between the year itself and the amount of garbage? Explain.
In Exercise 3.31

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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)