Question

p-value = ________

Short answer

p-value$=0.055$

Step-by-step solution

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 next $25$ flights. The average delay for those $25$ flights is $22$ minutes with a standard deviation of 15 minutes.

Explanation

The $p$-value can be calculated in excel by using CHIDIST ( ) formula as shown below:

Hence, the p-value is .$0.055$