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{"ops":[{"insert":"A company has recognized the importance of advertisement in promoting sales. The following data show its monthly sales both before and after advertisement. The period for comparison is taken from January to December in two successive years. Can it be concluded that the advertisement of the company has resulted in a significant increase in its sales?\n\n"},{"attributes":{"bold":true},"insert":"Month           Sales before advertisement            Sales after the the advertisement                                                                                   "},{"insert":"January                       21\t\t\t\t\t\t\t\t\t\t\t\t\t\t24\nFebruary                     15\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t18\nMarch                          31\t\t\t\t\t\t\t\t\t\t\t\t\t\t43\nApril                             21\t\t\t\t\t\t\t\t\t\t\t\t\t\t32\nMay                              48\t\t\t\t\t\t\t\t\t\t\t\t\t\t50\nJune                             50 \t\t\t\t\t\t\t\t\t\t\t\t\t\t61\nJuly\t\t\t\t\t\t\t\t54\t\t\t\t\t\t\t\t\t\t\t\t\t\t53\nAugust\t\t\t\t\t\t\t68\t\t\t\t\t\t\t\t\t\t\t\t\t\t72\nSeptember\t\t\t\t\t46\t\t\t\t\t\t\t\t\t\t\t\t\t\t51\nOctober\t\t\t\t\t\t70\t\t\t\t\t\t\t\t\t\t\t\t\t\t76\nNovember\t\t\t\t\t65\t\t\t\t\t\t\t\t\t\t\t\t\t\t72\nDecember\t\t\t\t\t53\t\t\t\t\t\t\t\t\t\t\t\t\t\t59\n\nMean (paired differences) = 5.75 and SD (paired differences) = 3.58\u00a0\u00a0\n"}]}

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