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Mathematics, 08.11.2019 06:31 kennycooper3096

Aresearch engineer for a tire manufacturer is investigating tire life for a new rubber compound. she has built 10 tires and tested them to end-of-life in a road test. the sample mean and standard deviation are 61,492 and 2990 kilometers, respectively. assume population is approximately normally distributed. (a) can you conclude, using =0.05, that the standard deviation of tire life exceeds 3000 km ? yes ot no ?

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