Time Series and Non-Parametric Tests

1. Perform a Trend and Seasonal analysis with the following data. Include the trend formula and the multiplicative indices for the seasons. Using the model forecast sales for the next year (all 4 seasons of year 4). (20 points)

Year Season Sales

1 sp 140

1 su 50

1 w 130

1 f 520

2 sp 200

2 su 110

2 w 190

2 f 550

3 sp 260

3 su 220

3 w 210

3 f 570