The Kandla Port has unloaded large quantities of grain from ships during the past 8 quarters. The port’s operations manager wants to forecast for the future based on the following methods and calculate the errors.

Quarter	1	2	3	4	5	6	7	8
Actual tonnage unloaded	180	168	129	175	190	205	180	182

a.Forecast the annual tonnage unloaded during 9^th quarter using Naive method

b.Forecast the annual tonnage unloaded during 9^th quarter using 4 period moving average

c.Forecast the annual tonnage unloaded during 9^th quarter using 4 period weighted moving average using weights as 0.4, 0.3,0.2,0.1.

d.Forecast the annual tonnage unloaded during 9^th quarter using exponential smoothing with constant 0.4

e.Forecast the annual tonnage unloaded during 9^th, 10^th and 11^th quarter using linear regression method.

 f.Calculate forecast accuracy for the above methods (Error, MAD, MSE, MAPE) and infer the best method for the data using tracking signal.