The annual number of Memorial Day travelers from 1992 through 1999 is shown here.

                    Year                                   Travelers (millions)

1992…………………………………… 27.0

1993…………………………………… 28.6

1994…………………………………… 29.2

1995…………………………………… 30.0

1996…………………………………… 30.3

1997…………………………………… 31.8

1998…………………………………… 32.0

1999…………………………………… 33.4

a. Fit a linear trend equation to the time series. Using this equation, determine the trend estimate for 2010.
b. Fit a quadratic equation to the time series, then use the equation to determine the trend estimate for 2010.
c. Which of the preceding equations is the better fit to the time series if the MAD criterion is used? If the MSE criterion is used?