a$.$ Construct a table in which you show the actual data, the centered moving$-$average trend, the seasonal factors, and the cycle factors for every quarter for which they can be calculated in years $2012$ through $2015.$

b$.$ Look at the seasonal index for each quarter as calculated in forecastX. Do they make sense to you? Explain why or why not.

c$.$ Make a forecast of the number of customers for each quarter of $2016.$

d$.$ The actual numbers of customers served per quarter in $2016$ were $6\mathrm{.}8,5\mathrm{.}1,4\mathrm{.}7,$ and $6\mathrm{.}5$ for quarters $1$ through $4,$ respectively. Calculate the MAPE for $2016.$

e$.$ Using the results provided in the tables produced by ForecastX, prepare a time$-$series plot of the actual data, the centered moving averages, the long$-$term trend, and the values predicted by your model for $2012$ through $2016.$