Question: A light-bulb manufacturer advertises that the average life for its light bulbs is 900 hours. A random sample of 15 of its light bulbs resulted in the following lives in hours. Assume the data has been randomly selected from a population with a normal distribution. Using a = .10, test the claim that the data provide evidence that the mean life for the company's light bulbs differs from the advertised mean.

995 590 510 539 739 917 571 555 916 728 664

693 708 887 849

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