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Chapter 11: Q.111 (page 668)

Is this a right-tailed, left-tailed, or two-tailed test?

Short Answer

Expert verified

The test is right-tailed test.

Step by step solution

01

Given information

Given in the question that, Suppose an airline claims that its flights are consistently on time with an average delay of at most 15 minutes. It claims that the average delay is so consistent that the variance is no more than 150 minutes. Doubting the consistency part of the claim, a disgruntled traveler calculates the delays for his next25 flights. The average delay for those 25 flights is 22 minutes with a standard deviation of 15 minutes.

02

Explanation

The null hypothesis is shown below:

H0:蟽2鈮�150

That is, the variance is no more than 150.

Against the alternative hypothesis as shown below:

Ha:蟽2>150

That is, the variance is more than 150.

The alternative hypothesis sign that is ">" tells that the test is right-tailed test.

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