Question: 6. The mean time between failures (in hours) for a certain type of radio used in light aircraft is 420 hours. Suppose that 25 new

6. The mean time between failures (in hours) for a certain type of radio used in light aircraft is 420 hours. Suppose that 25 new radios have been modified for more reliability, and tests show that the mean time between failures for this sample is 410 hours with a sample standard deviation of time to failures is 24 hours. Test the claim that the modification improved the reliability at 5% level of significance. (Assume that the distribution of the time to failure is normal). Use the p-value approach. H₀: H₁:<420

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