Using the time series data in the table, respond to the following items.   Period Sales 1 $ 615   2   676   3   761   4   710   5   784   6   801   7   852   8   698   9   1,193   10   1,115   11   1,231   12   1,259   13   1,495   14   1,229   15   1,652   16   1,337   17   1,673   18   1,613

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