Please help me understand this

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Please help me understand this statistics problem...Based on information from Consumer Reports, a random sample of 15 thirty-gram servings of Duncan Hines Chocolate Chip Cookies had a sample mean of 124 calories and a standard deviation of 27 calories. A random sample of 11 Pepperidge Farm Chocolate Chip Cookies had a sample mean of 132 calories and a standard deviation of 33 calories. Does the information indicate there is a difference in the average number of calories in these two brands of cookies? Use a 5% level of significance for the test.

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