Question: The marketing manager for a major retail groceries chain is wondering about the location of the at dairy products. She believes that the mean amount spent by customers on dairy products per visits is higher in stores where the dairy section is in the central part of the store compared with stores that have the dairy section at the rear of the store. consider relocating the dairy products, the manager feels that the increase in the mean amount spent by customers must be at least 25 cents. To determine whether relocation is justified or not, her staff selected random sample of 25 customers at stores where the dairy section is central in the store. A second sample of 25 customers was selected in stores the dairy section at the rear of the store. The following sample results were observed:

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