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Mathematics, 03.04.2020 03:13 elliebomb13

The life in hours of a biomedical device under development in the laboratory is known to be approximately normally distributed. A random sample of 15 devices is selected and found to have an average life of 5311.4 hours and a sample standard deviation of 220.7 hours.

Test the hypothesis that the true mean life of a biomedical device is greater than 5200.

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