An airline observes a random sample of its flights on a particular route. The 95

Question

An airline observes a random sample of its flights on a particular route. The 95% confidence interval for the mean time (in minutes) for all flights on this route is calculated to be (47.0, 53.0). Which of the following is NOT true? (A) At the 95% confidence level, the true mean flight time is within 3.0 minutes of the sample mean flight time. (B) If the true mean flight time were outside the interval (47.0, 53.0) then the sample mean that was found would be very unlikely. (C) Approximately 2 1/2 % of flights on this route are longer than 53 minutes. (D) We are 95% confident that the true mean flight time is between 47.0 and 53.0 minutes. (E) If many random samples of the same size were taken and the 95% confidence intervals were calculated, then 95% of the confidence intervals would contain the true mean flight time.

Explanation / Answer

Approximately 2.5 percent of flights on this route are longer than 53 minutes. This statement is not true. I.e statement 'C' is not true

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