Month	2016	2017	2018	2019
Jan	1498	1416	1301	1174
Feb	757	721	739	696
Mar	749	737	764	715
Apr	739	759	740
May	808	811	816
Jun	743	734	757
Jul	717	699	731
Aug	1554	1404	1394
Sept	1094	1027	1016
Oct	745	719	771
Nov	772	733	798
Dec	1286	1187	1289

The following data report total, monthly U.S. book-store sales In millions of dollars from January 2016 to March 2019. (Go to https://www.census.gov/retall/Index.html#mrts, find "Monthly Retail Trade Report," then select "Time Series/Trend Charts* to find the data for the total U.S. bookstore sales.) Year Month 2016 2017 2018 2019 January $1, 498 $1, 416 $1, 301 $1, 174 February 757 721 739 696 March 749 737 764 715 April 739 759 May 808 811 817 June 743 734 757 July 717 699 731 August 1, 554 1, 484 1, 394 September 1, 094 1, 927 1, 816 October 745 719 771 November 772 733 798 December 1, 286 1, 187 1, 289 Click here for the Excel Data File c. Which forecasting model is appropriate based on the data for the total U.S. bookstore sales? Appropriate model Regression analysisd. Evaluate a seasonally adjusted trend forecasting mode. What Is the MAD? (Round your answers to 4 decimal places.) Abcoluta Farlod Trend Forpouch Month Number Index Error IMIIIIons 1 1,408 1 757 2 749 4 743 6 717 1,654 ID 09 -4 1,094 745 10 11 772 11 12 12 1,416 13 721 14 737 15 16 811 17 734 18 19 1,404 20 1,027 21 719 22 733 23 ,187 24 1,301 25 730 26 764 27 740 817 757 30 731 31 1,304 32 1 016 33 771 34 11 12 36 1,174 37 1 N - 38 30 MADE=. What is the average monthly trend in book-store sales? (Negative amounts should be Indicated by a minus sign. Round your answer to 4 decimal places.) Average monthly trend in book-store sales million dollars per month f-1. What are the monthly indexes? (Round your answers to 4 decimal places.) Month Index 1 4 10 12g. Predict book sales for the next 9 months. (Round your answers to 4 decimal places.) Year Month Forecast Sales 2019 April 2019 May 2018 June 2019 July 2019 August 2018 September 2018 October 2018 November 2018 December