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Noise levels at 3 volcanoes were measured in decibels yielding the following data: 149,163,157 Construct the...

Noise levels at 3 volcanoes were measured in decibels yielding the following data:

149,163,157

Construct the 90% confidence interval for the mean noise level at such locations. Assume the population is approximately normal.

1. Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

2. Find the upper and lower endpoints

Math   Statistics-And-Probability   
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