The following table lists a portion of the percentage (share) of total shipment of music that falls in the category of country and rap/hiphop rock music from 1990-2008.

Year..................... Country (in %)................ Rap/Hip-hop (in %)

1990.................................. 9.6..................................... 8.5

1991.................................. 12.8...................................10.0

⋮.......................................... ⋮....................................... ⋮

2008.................................. 11.9...................................10.7

a. Plot each of the above series and comment on the respective trend.

b. Estimate a linear, a quadratic, and a cubic trend model for the share of country music in the United States. Use adjusted R2 to choose the preferred model and with this model make a forecast for 2009.

c. Estimate a linear, a quadratic, and a cubic trend model for the share of rap/hip-hop music in the United States. Use adjusted R2 to choose thepreferred model and with this model make a forecast for 2009.