The average price of a sample of 12 bottles of diet salad dressing taken from different stores is $1.43. The standard deviation is $0.09. The average price of a sample of 16 low-calorie frozen desserts is $1.03. The standard deviation is $0.10. At ? = 0.01, is there a significant difference in price? Find the 99% confidence interval of the difference in the means.
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