Noise levels at 6 airports were measured in decibels yielding the following data: 144,119,140,143,128, 112 Construct the 99% confidence interval for the mean noise level at such locations. Assume the population is approximately normal.     Step 1 of 4:  Calculate the sample mean for the given sample data. Round your answer to one decimal place. Step 2 of 4:  Calculate the sample standard deviation for the given sample data. Round your answer to one decimal place. Step 3 of 4:  Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places. Step 4 of 4:  Construct the 98%98% confidence interval. Round your answer to one decimal place.

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