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We are interested in comparing the average supermarket prices of two leading colas in the Tampa...

We are interested in comparing the average supermarket prices of two leading colas in the Tampa area. Our sample was taken by randomly going to each of eight supermarkets and recording the price of a six-pack of cola of each brand. Find a 98% confidence interval for the difference in mean price of brand 1 and brand 2. Assume that the paired data came from a population that is normally distributed. Summary information is as follows: d = −0.0375, Sd= 0.0381

Math   Statistics-And-Probability   
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Therefore, based on the information provided, the 98% confidence for the population mean is calculated as:

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