A LED bulb manufacturer records the yearly sales (in lakhs) of its popular brand in India. The following data were collected for past 10 years. 

i. Use two point weighted moving average method to forecast sales for 11^th year, considering weight for current year as 0.6 and its previous year as 0.4. 

ii. Find forecast for 11th year by exponential smoothing method using smoothing factor alpha as 0.9 and year 1 forecast as 2 lakhs. 

iii. Discuss what all needs to be checked for accepting forecast of any of these methods.

Year: 4 7 8 9 10 Sales(in lakhs) : 2 3 9. 10 12 14 18 22 3 4