The US EPA has published the following data for the release to the Florida environment of sulfuric acid (H2SO4 ), the most widely used industrial chemical (in millions of pounds).
Year: 1992 1993 1994 1995 1996 1997 1998 1999 2000
H2SO4 : 2.475 2.293 1.966 1.729 1.636 1.785 2.284 1.692 1.588
Does there appear to be any trend (consistent increase or decrease with time) in the data? Plot the data on probability-scale graph paper. Is the data "normally" distributed?