In the following table are the data from Exercise 16.53 on battery lives, in hours, for samples of laptops made by four different computer companies. The four brands are Apple, Dell, Samsung, and Toshiba, but we have not used the names and have permuted the order. Use a 95% family confidence level.

Perform a Tukey multiple comparison at the specified family confidence level.

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Brand A Brand B Brand C Brand D 7.25 9.50 6.25 8.00 8.25 10.25 6.25 5.75 12.00 7.25 11.75 15.00 8.50 8.75 10.00 10.25 11.50 9.50 10.00 5.00 9.50 5.25 9.75 8.25 5.25 11.50 8.00 7.50 5.50 4.75 6.25 6.00 4.75 4.50