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Business, 13.08.2019 03:20 lionessny6301

9. a manufacturer of computer terminals claims its products will last at least 2000 hours without needing repairs. data incorporated is considering purchasing a great many of their computer terminals. before agreeing to buy the manager of data, inc. randomly selected a sample of 81 records of the manufacturer’s terminals. the average time before the first breakdown was 1,980 hours with a standard deviation of 120 hours. what conclusion should the manager reached at the 5% level of significance?

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