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A simple random sample of Boeing 747 aircraft is selected and the time (in hours) required...

A simple random sample of Boeing 747 aircraft is selected and the time (in hours) required to test for structural stress fractures are as follows: 8.1, 9.9. 9.5. 6.9, 9.8.  Based on these results, a confidence interval is found to be μ = 8.84 ± 1.24.  Find the degree of confidence.  

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