Noise levels at 5 airports were measured in decibels yielding the following data: 162,176,162,141,159 Construct the 90% 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.

Igot the answer of 15.8 years.

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