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.

Question

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.