The following data shows seasonal attendance at broadway theaters in New York City over a five year period.

a. Plot the series indicate the appropriateness of seasonal and trend time series components.

b. Develop and produce the seasonal indexes after all your correction by multiple regression methods in Minitab.

c. Complete the final forecast for each quarter of year 6. The model should have both seasonality and trend.

Year 1 2 3 4 5 Quarter 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 Sales (000) 6 15 10 7 10 18 15 7 14 26 23 14 19 28 25 20 22 34 28 22