This is not the answer that lines up with the one in the book. Can I get a solut

Question

This is not the answer that lines up with the one in the book. Can I get a solution for the following question: have the data in the worksheet defects after delivery changed significantly over the past 5 years?

Here is the data:

Defects After Delivery Defects per million items received from suppliers Month 2010 2011 2012 2013 2014 January 812 828 824 682 571 February 810 832 836 695 575 March 813 847 818 692 547 April 823 839 825 686 542 May 832 832 804 673 532 June 848 840 812 681 496 July 837 849 806 696 472 August 831 857 798 688 460 September 827 839 804 671 441 October 838 842 713 645 445 November 826 828 705 617 438 December 819 816 686 603 436

Explanation / Answer

we can use Anova single factor

since p-value = 8.67824E-31 << 0.05

the difference is significant

hence defects after delivery changed significantly over the past 5 years

Anova: Single Factor SUMMARY Groups Count Sum Average Variance 2010 12 9916 826.3333333 135.3333333 2011 12 10049 837.4166667 121.5378788 2012 12 9431 785.9166667 2749.719697 2013 12 8029 669.0833333 959.3560606 2014 12 5955 496.25 2940.022727 ANOVA Source of Variation SS df MS F P-value Between Groups 984600.3333 4 246150.0833 178.2154383 8.67824E-31 Within Groups 75965.66667 55 1381.193939 Total 1060566 59

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