Mathematics, 30.04.2021 22:00 rwerjekrryery6750

A computer battery is found to have a mean time between charges of 13 hours. A modification is made which is supposed to increase battery life. Test on a random sample of 35 modified computers resulted in mean battery life of 13.6 hours with a standard deviation 0.5 hours. At the 95% confidence level, test the claim that the mean time between charges is longer after the modification.

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