The following data report total, monthly U.S. gasoline sales in millions of dollars from January 2017 to December 2018. (To find the data, go to the site https://www.census.gov/retail/index.html#mrts, find "Monthly Retail Trade Report," then select "Time Series/Trend Charts.") Year 2017 2017 2017 2017 2017 2017 2017 2017 2017 2017 2017 2017 2018 2018 2018 2018 2018 2018 2018 2018 2018 2018 2018 2018 Sales Month ($ millions) $34,230 32,572 37,222 37,573 39,339 38,609 38,397 39,817 39,946 40,317 38,786 38,646 37,823 35,977 41,248 41,709 46,649 46,146 46,591 47,433 44,185 46,942 41,839 38,226 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Click here for the Excel Data File d. Evaluate a seasonally adjusted trend forecasting model. What is the MAD? (Round your answers to 3 decimal places.)

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