Management at a large retail appliance chain required all full-time sales staff to attend a one-day training session on improving sales staff to attend a one-day training session on improving sales technique. To evaluate the effectiveness of this rather expensive training, the number of sales in the week prior to the training and the number of sales in the week following the training was recorded for each salesperson. Data for the 10 full times salespersons at one branch of the store appears in the accompanying table.

Does the data provide convincing statistical evidence that, on average, employees make a greater number of weekly sales after the training? Test the appropriate hypotheses at the .01 level. Validate any necessary conditions.

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Salesperson After sales training Before sales training Difference 12 3 4 5 6 7 8 9 10 44 53 30 41 53 63 55 68 35 41 50 45 25 40 45 55 40 54 33 49 -6 8 5 18 8 15 14 2-8