The lifespan of xenon metal halide arc-discharge bulbs for aircraft landing lights is normally distributed with a mean of 2,600 hours and a standard deviation of 550 hours. (a) If a new ballast system shows a mean life of 3,143 hours in a test on a sample of 12 prototype new bulbs, would you conclude that the new lamp's mean life exceeds the current mean life at a = 0.05? O No O Yes (b) What is the p-value? (Round your answer to 4 decimal places.) p-value

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