Consumer Reports publishes reviews and comparisons of products based on results from its laboratory. Data from their website gave the following table for 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.

At the 5% significance level, do the data provide sufficient evidence to conclude that a difference exists in mean battery life among the four brands?

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