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.
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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