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7. (15 pts) A sample of 36 sheets of metal from a large normal population has a mean thickness of 30 mm. We know from

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7. (15 pts) A sample of 36 sheets of metal from a large normal population has a mean thickness of 30 mm. We know from previous quality control testing that the population standard deviation is 3.3 mm. Develop a 95% confidence interval for the true mean for the population

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