The following table lists a portion of the percentage (share) of total shipment of music that falls in the category of country and rap/hip-hop rock music from 1990-2008. The complete data set is on the text website, labeled Country and Rap.
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 their 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 their adjusted R2 to choose the preferred model and with this model make a forecast for 2009.