What is the average difference between the price of name-brand soup and the price of store-brand soup? To obtain an estimate, an analyst randomly samples eight stores. Each store sells its own brand and a national name brand. The prices of a can of name-brand tomato soup and a can of the store-brand tomato soup follow.

Construct a 90% confidence interval to estimate the average difference. Assume that the differences in prices of tomato soup are normally distributed in the population.

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