Econe Dresses is a small company that manufactures women's dresses

Econe Dresses is a small company that manufactures women's dresses for sale to specialty stores. It has 1,200 inventory items, and the historical cost is recorded on a firstin, first-out (FIFO) basis. In the past, approximately 15% of the inventory items were incorrectly priced. However, any misstatements were usually not significant. A sample of 120 items was selected (see the Fifo file), and the historical cost of each item was compared with the audited value. The results indicated that 15 items differed in their historical costs and audited values. These values were as follows:
Econe Dresses is a small company that manufactures women's dresses

Construct a 95% confidence interval estimate for the total population difference in the historical cost and audited value.

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