a$)$ Naive method

b$)4-$quarter moving average

c$)4$ quarter weighted moving average with weights $0\mathrm{.}4,0\mathrm{.}3,0\mathrm{.}2$ and $0\mathrm{.}1$

d$)$ Exponential smoothing with alpha $0\mathrm{.}2$ and forecast value $275$ for the first quarter of $2013.$

e$)$ Use RMSE model and decide which technique $($moving average or exponential$)$ is better? Briefly explain.

f$)$ Plot the quarterly data, moving average and exponential smoothing estimates.Briefly explain the patterns.