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Confidence interval for the mean airborne time

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Reference no: EM131152876

The Bureau of Transportation Statistics provides data on U.S. airline flights. The airborne times (in minutes) for United Airlines flight 448 from Albuquerque to Denver on 10 randomly selected days between January 1, 2003, and March 31, 2003, are in the following table.

57 54 55 51 56 48 52 51 59 59

Compute a98%confidence interval for the mean airborne time for flight 448. (Use Table 3 inAppendix A. Give the answer to two decimal places.)

One article describes a study of 52 young adults with pierced tongues. The researchers found receding gums, which can lead to tooth loss, in 16 of the participants.(a) Construct a 95% confidence interval for the proportion of young adults with pierced tongues who have receding gums. (Use Table 3 in Appendix A. Give the answer to three decimal places.)

Reference no: EM131152876

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