Ace used-car sales manager Jack has no idea whether the $100,000 he pays for training for his used-cars salespeople works. He asked Dave the leading salesperson and Save says he thinks it works but can't really tell. So, Jack has hired your local helpful stats star and asked whether the training makes a difference. Here are the data- you tell Jack whether the training worked. After After Month Before Training Training Month Before Training Training December $58,676 $87,890 June $67,656 $99,878 January $46,567 $87,876 July $78,887 $67,578 February $87,656 $56,768 August $65,454 $76,599 March $65,431 $98,980 September $56,554 $88,767 April $56,543 $98,784 October $58,876 $78,778 May $45,456 $65,414 November $54,433 $98,898