suppose an airline claims that it's flights are consistently on time with an average delay of most 15 minutes. It claims that the average delay is so consistent that the variance is no more than 15 minutes. Doubting the consistency part of the claim, a disgruntled traveler calculates the fray for his next 25 flights. The average delay  for those 25 flights is 22 minutes with a standard deviation of 15 minutes.   D) decision about hypothesis      E) conclusion

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