The U.S. Department of Agriculture

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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).

 

Broccoli

 

Broccoli

Month

(million pounds)

Month

(million pounds)

January (1st year)

132.5

January (2nd year)

104.9

February

164.8

February

99.3

March

141.2

March

102.0

April

133.8

April

122.4

May

138.4

May

112.1

June

150.9

June

108.4

July

146.6

July

119.0

August

146.9

August

119.0

September

138.7

September

114.9

October

128.0

October

106.0

November

112.4

November

111.7

December

121.0

December

112.3

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