The number of deaths from collisions at highway-railroad crossings is shown in Table 43 for various years.
Table 43
Numbers of Deaths from Collisions at Highway-railroad Crossings
YearNumber of Deaths
1990 ………………………….698
1995 ………………………….579
2000 ………………………….425
2005 ………………………….359
2010 ………………………….260
2013 ………………………….251
a. Construct a time-series plot.
b. Has the number of deaths from collisions per year increased, decreased, stayed approximately constant, or none of these?
c. Find the change in the number of deaths from collisions from 2010 to 2013. What does it mean in this situation?
d. Find the change in the number of deaths from collisions from 2005 to 2013. If the number of deaths changes by the same amount from 2013 to 2021, what will it be in 2021? Do you have much faith that this will turn out to be true? Explain.