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6. Random samples 9 metal cylinders and found that the diameter length of them (in cm.) are 1.01 0.97 1.03 1.04 0.99 0.98 0.99 1.01

6. Random samples 9 metal cylinders and found that the diameter length of them (in cm.) are 1.01 0.97 1.03 1.04 0.99 0.98 0.99 1.01 1.03 Find a 99% confidence interval of the population mean of diameter length of these cylinders

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