The League of American Theatres and Producers, Inc., collects a variety of statistics for Broadway plays, such as gross revenue, playing time, and number of new productions. The following data show the season attendance (in millions) for Broadway shows from 1990 to 2001 (The World Almanac 2002):

a. Plot the time series and comment on the appropriateness of a linear trend.
b. Develop the equation for the linear trend component for this time series.
c. What is the average increase in attendance per season?
d. Use the trend equation to forecast attendance for the 2001–2002season.

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Attendance (in millions) 7.3 7.4 7.9 Attendance (in millions) Season 1990-1991 1991-1992 1992-1993 1993-1994 1994-1995 1995-1996 Season 1996-1997 1997-1998 1998-1999 1999-2000 2000-2001 10.6 11.5 11.7 11.4 11.9 9.0 9.5