The total numbers of animal and plant species in the United States that are listed as endangered or threatened are shown in Table 50 for various years.

Let n be the number of species that are listed as endangered or threatened at t years since 1980.
a. Construct a scatterplot by hand.
b. Is there a linear association, a nonlinear association, or no association?
c. Draw a linear model on your scatterplot.
d. Estimate when 800 species were listed.
e. Estimate the number of species that were listed in 2008.

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Table 50 Numbers of Endangered or Threatened Species Number of Species Listed Year 1985 1990 1995 2000 2005 2011 2013 384 596 962 1244 1264 1967 1519