Two Questions: Multiple regression model and non conformity sample test.

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newcarsales.xlsx
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New car sales

New Car Retail Sales
Year Month Units
1 Jan 39,810
1 Feb 40,081
1 Mar 47,440
1 Apr 47,297
1 May 49,211
1 Jun 51,479
1 Jul 46,466
1 Aug 45,208
1 Sep 44,800
1 Oct 46,989
1 Nov 42,161
1 Dec 44,186
2 Jan 42,227
2 Feb 45,422
2 Mar 54,075
2 Apr 50,926
2 May 53,572
2 Jun 54,920
2 Jul 54,449
2 Aug 56,079
2 Sep 52,177
2 Oct 50,087
2 Nov 48,513
2 Dec 49,278
3 Jan 48,134
3 Feb 54,887
3 Mar 61,064
3 Apr 53,350
3 May 59,467
3 Jun 59,370
3 Jul 55,088
3 Aug 59,349
3 Sep 54,472
3 Oct 53,164
3 Nov 48,793
3 Dec 46,956