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need graph and step by step A heavy-duty battery is guaranteed to last at least 136 hours. A maintenance supervisor in a larger project randomly

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A heavy-duty battery is guaranteed to last at least 136 hours. A maintenance supervisor in a larger project randomly tests 20 of them and finds a mean of only 131 hours with a standard deviation of 13 hours. Test the supervisor's claim at a 0.05 level of significance? Need graph and step by step (Ctrl)

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