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Question 9 Qui USA Today reports that the average age of commercial jets in the Not yet USA is 14 years. A retired pilot disagrees with the claim and samples answered 39 jets. He finds the mean age to be 15.4 years with a standard Marked out of 1.00 deviation of 2.7 years. What are the null and alternative hypotheses? 10 Flag question Select one: Finis O a. Ho : 1 / 14, Ha : p = 14 O b. Ho : p - 14, Ha : p / 14 Time O c. Ho : 2 - 15.4, Ha : c / 15.4 O d. Ho : a / 15.4, Ha : 2 - 15.4 Previous page Next page e 199+ W