Noise levels at 5 airports were measured in decibels yielding the following data: 146,162,170,152,187 Construct the...
Noise levels at 5 airports were measured in decibels yielding the following data: 146,162,170,152,187 Construct the 80% 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.
Homework Answers
| Values ( X ) |
 |
|
| 146 | 302.76 | |
| 162 | 1.96 | |
| 170 | 43.56 | |
| 152 | 129.96 | |
| 187 | 556.96 | |
| Total | 817 | 1035.2 |
Mean 
Standard deviation 
Confidence Interval
Lower Limit = 
Lower Limit = 152.3694
Upper Limit = 
Upper Limit = 174.4306
80% Confidence interval is ( 152.4 , 174.4 )
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