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Noise levels at 5 concerts were measured in decibels yielding the following data: 142,142,123,133,139 Construct the...

Noise levels at 5 concerts were measured in decibels yielding the following data: 142,142,123,133,139 Construct the 99% confidence interval for the mean noise level at such locations. Assume the population is approximately normal. Step 3 of 4 : Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

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