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The average price of a sample of 12 bottles of diet salad dressing taken from different stores is $1.43 with a standard deviation of $0.09. The average price of a sample of 16 low calorie frozen desserts is $1.03 with a standard deviation of $0.10. Using diet salad dressing as population 1 find the 99% confidence interval for the mean difference in price of the diet salad dressing and low calorie frozen yogurt. Assume the prices of each are normally distributed.

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