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The aircraft engine manufacturer alters its process and retests 23 engines. This time it concludes that the average turbine is 500.2 cm, estimates that the

The aircraft engine manufacturer alters its process and retests 23 engines. This time it concludes that the average turbine is 500.2 cm, estimates that the standard deviation is 1.0 cm, and determines that the t-value is 2.819. What is the 99% confidence interval

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