This is posted on behalf of LilDragonfly.
Below is a data set called "Ice-cream data". It gives the sales in
millions of dollars of ice-cream in an unnamed country over five years.
Use this dataset to answer Q5 to 7 below.
5. Calculate a centred moving average and plot this smoothed data and the
raw data on the same axes.
6. Comprehensivly describe at least two features of this time series.
7. Forcast the sales for the next four seasons based on:
a) a trend line fitted to the smoothed data
b) your extimate of seasonal effects
You must show and describe your calculations and give evidence of your method.