1) A manufacturer claims that the average battery life of their product is 20 hours. A random sample of 25 batteries has an average life of 18 hours with a standard deviation of 3 hours. Is there evidence to suggest that the batteries' average life is significantly different from the claimed value at a 10% significance level?

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A: From the above given data the following solution is provided below:

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Q: could u answer the second one please

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