1. Ice cream consumption is highly depending on the weather . the seasonal structure in its productions should adjust to these differences. We analyzed the sale of an ice cream production( thousand litres) company from 2010 t0 2019on a quarter base.

S1= -27.7

S2= 19.2

S3= 48.1

1. Given the above information, what type of seasonality is applied in this case? (1p)
2. Compute the missing seasonal component of Q4(s4). (2p)
3. Interpret s1. (2p)