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A manufacturer claims that the mean lifetime of its lithium batteries is 1200 hours. A homeowner selects 25 of these batteries and finds the mean lifetime to be 1180 hours with a standard deviation of 80 hours. Test the manufacturer's claim. Use ΅ = 0.05. Round the test statistic to the nearest thousandth.
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Ten times the square of a non-zero number is eqaul to ninety times the number
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A manufacturer claims that the mean lifetime of its lithium batteries is 1200 hours. A homeowner sel...
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