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9. Researchers want to study noise levels produced by vehicles on a busy street. The mean noise level for 27 vehicles was 82.5 decibels, with

9. Researchers want to study noise levels produced by vehicles on a busy street. The mean noise level for 27 vehicles was 82.5 decibels, with a standard deviation is 2.6 decibels. Find the 95% confidence interval of the true mean. [4 marks] Round answers to two decimal places and separate your answers with commas; For example: (10.13,12.64)

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