Carbon tetrachloride is an ozone-depleting chemical found in the atmosphere. The table below shows the concentration of the chemical in parts per trillion (ppt) measured in the European Union.

a. Make a scatter plot of the data, and find the least squares line to fit the data.
b. Use your model to predict the amount of carbon tetrachloride present in 2005.
c. In 1987, 22 countries and the European Economic Community agreed on the Montreal Protocol to reduce ozone-depleting chemicals in the atmosphere. In 1989, the protocol went into effect. The data below represent the levels of carbon tetrachloride from 1990 to 1997. Make a scatter plot of the data, and find the least squares line to fit the data.

d. Use the model you found in 5c to predict the amount of carbon tetrachloride in 2005. How does this compare to your answer in 5b?

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Year 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 Carbon tetrachloride (ppt) 87.3 90.7 92.1 93.6 94.3 95.5 96.5 97.8 99.3 100.3 102.0 103.3 1990 1991 1992 1993 1994 1995 1996 1997 Year Carbon tetrachloride (ppt) 104.2 103.2 102.9 102. 101.3 100.8 99.5 98.6