Question: The data in the table below are for retail sales in book stores by quarter. a. Plot these data and examine the plot. Does this

The data in the table below are for retail sales in book stores by quarter.

a. Plot these data and examine the plot. Does this view of the data suggest a particular smoothing model? Do the data appear to be seasonal? Explain.
b. Use a smoothing method to forecast the next four quarters. Plot the actual and forecast values.

les 4961620070209130 92812383229 3 4 3 3 4 4 3 3 4 4 3 3 4 4 3 3 4 4 4 3444344 me 99 99 99 99 00 00 :00 on 01 01 01 doz 02 02 03 03 03 04 04 04-da OS 05 OS OS 6615958760855 ,3 4 1 8 4 6 3 0 8 9 7 2 10841415262757 n-S-1122212222222233223332333233 2 2 2 2 3 3 3 3 4 4 4 4 5 5 5 6 6 6 77778888 |-9 9, 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9-9-99-9-9 dat-Mar lun Sep Dec Mar lun Sep Dec Mar lun Sep Dec Mar lun Sep Dec Mar lun Sep Dec Mar Sep Dec Mar lun Sep Dec

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