The Costa Gravas Company wants to evaluate two different in store promotions for its latest entry into the consumer electronics market. You have matched retail stores that carry the product according to size and location. You now randomly choose five matched pairs of stores, then randomly assign one store in each pair to Promotion1 and the other to Promotion 2. At the end of the month, the change in product sales (versus the previous month) for each store is reported. Using the data in the table below and assuming that the necessary populations conditions are satisfied build a 95% confidence interval estimate of the difference in average sales changes for the populations represented.

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Change in Product Sales ($000s) Store Pairs Promotion1 6.6 8.6 9.4 .0 8.0 Promotion 2 5.8 6.0 7 8.9 5.7 Difference (d) +8 +2.6 +2.2 +2.1 +2.3 4