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Problem 4 A manufacturer of batteries states that the lifetime of the batteries produced in her factory is approximately normally distributed with a standard deviation

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Problem 4 A manufacturer of batteries states that the lifetime of the batteries produced in her factory is approximately normally distributed with a standard deviation 0 of 0.9 years. If a random sample of 10 of these batteries has a standard deviation of 1.2 years, do you think that or > 0.9 years? Test this hypothesis using a 0.05 level of signicance

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