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20 Dec 2021
Problem 111
Page 623
Section: HOMEWORK
Chapter 11: THE CHI-SQUARE DISTRIBUTION
Textbook ExpertVerified Tutor
20 Dec 2021
Given information
A maximum delay of 15 minutes is expected.
The difference is less than 150 minutes.
Calculates his next 25 flights delays.
With a standard deviation of 15 minutes, the average delay for those 25 flights is 22 minutes.
Step-by-step explanation
Step 1.
The Alternative Hypothesis 
determines the sort of test.
- The rejection area of a two-tailed hypothesis test is divided equally between two critical values at the extremes of the distribution. When an alternative hypothesis equals a given quantity
, a two-tailed test is used. - A right-tailed hypothesis test is one in which the rejection region is at the extreme right of the distribution. When the alternative hypothesis contains the criterion
, a right-tailed test is used (greater than a given quantity). - Hypothesis Test with a Left-Tailed Rejection Zone - A Hypothesis Test with a rejection region on the extreme left of the distribution. When the alternative hypothesis contains the condition
, a left-tailed test is used (less than a given quantity).
"The variance is no more than 
minutes," it says when considering the question. We can deduce that this is a left-tailed test from this.
Conclusion: Left-tailed test
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Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208
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