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//SAMPLE ADVANCED STATISTICAL DATA . A sales manager wants to know if display at point of purchase helps in increasing the sales of his product.

//SAMPLE ADVANCED STATISTICAL DATA .

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A sales manager wants to know if display at point of purchase helps in increasing the sales of his product. He note the following observations: Shop No. 2 4 5 6 7 8 9 10 11 Sales before display 5275 7235 6844 5991 6672 4943 7615 6148 5623 5154 Sales after 4834 display 5010 7562 6957 6401 6423 5334 8004 6729 6277 5769 Difference(d) 265 -J2 1 -113 -410 249 -391 -389 -654 -615 d= -300 Sa = 314.53 Is there sufficient evidence to conclude that display at point of purchase helps in increasing the sales of his product

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