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Consider an airline that claims its flights are always on time, with an average delay of no more than 15 minutes. The average delay, it maintains, is so consistent that the variance is less than 150 minutes. A unhappy traveller calculates the delays for his following 25 flights, doubting the claim's consistency. With a standard deviation of 15 minutes, the average delay for those 25 flights is 22 minutes.
Let 
.
Step-by-step explanation
Step 1.
Consider that, Null hypothesis 
, alternative hypothesis 
.
The following formula can be used to compute the test statistic.
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Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208
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