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Easy-Fly Airline took a random sample of 25 flights to determine if the mean time it takes for luggage to reach the travelers departing from a flight is less than 15 minutes. The sample mean was found to be 13.8 minutes with a standard deviation of four minutes.

a. Using a significance level of .05, what conclusion can be reached based on the_{random sample}?

b. What assumption about the data is necessary for the hypothesis test to be valid in this situation?

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