The U.S. Department of Agriculture publishes statistics on the production of various types of food commodities by

Question:

The U.S. Department of Agriculture publishes statistics on the production of various types of food commodities by month. Shown here are the production figures on broccoli for January of a recent year through December of the next year.
Use these data to compute 12-month centered moving averages (T. C).Using these computed values, determine the seasonal effects (S.I).