The number of railroad passengers has been increasing in the United States. The table shows railroad ridership from 1988 to 2000.
a. Plot the data and find the median-median line.
b. Calculate the residuals.
c. What is the root mean square error for this model?
Explain what it means in this context.
d. If the trend continues, what is a good estimate of the ridership in 2010?

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Passengers Passengers Year(millions) Year(millions) 1988 1989 1990 1991 1992 1993 1994 36.9 38.8 40.2 40.1 41.6 55.0 60.7 1995 1996 1997 1998 1999 2000 62.9 65.6 68.7 75.1 79.8 84.1