# SOLUTION: Most air traffic passenger use e-tickets. Electronic ticketing allows passengers not worry about paper tickets and it reduces the airlines costs. However in recent times airline

Algebra ->  Algebra  -> Rational-functions -> SOLUTION: Most air traffic passenger use e-tickets. Electronic ticketing allows passengers not worry about paper tickets and it reduces the airlines costs. However in recent times airline      Log On

 Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help! Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!

 Algebra: Rational Functions, analyzing and graphing Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Rational-functions Question 272577: Most air traffic passenger use e-tickets. Electronic ticketing allows passengers not worry about paper tickets and it reduces the airlines costs. However in recent times airlines have begun to receive complaints from passengers regarding e-tickets, especially when having to switch planes. To investigate this problem an independent watchdog agency contacted a random sample of 21 airports and collected data on the number of complaints due to e-tickets. The information is as follows; 14.00, 14.00, 16.00, 12.00, 12.00, 14.00, 13.00, 15.00, 16.00, 15.00, 14.00, 12.00, 15.00, 15.00, 14.00, 13.00, 13.00, 12.00, 13.00, 10.00, 13.00 At the .05 level of significance is there evidence to conclude that the ten year average of 15 complaints per month has now changed and actually increased due to electronic ticketing? Answer by stanbon(57390)   (Show Source): You can put this solution on YOUR website!To investigate this problem an independent watchdog agency contacted a random sample of 21 airports and collected data on the number of complaints due to e-tickets. The information is as follows; 14.00, 14.00, 16.00, 12.00, 12.00, 14.00, 13.00, 15.00, 16.00, 15.00, 14.00, 12.00, 15.00, 15.00, 14.00, 13.00, 13.00, 12.00, 13.00, 10.00, 13.00 At the .05 level of significance is there evidence to conclude that the ten year average of 15 complaints per month has now changed and actually increased due to electronic ticketing? ============== Ho: u = 15 Ha: u > 15 -------- sample mean = 13.57 ----- crit value for one-tail test, alpha=5%, df = 20: t =invT(0.95,20)= 1.7247 ----- test statistic: t(13.57) = (13.57-15)/(1.5/sqrt(21)) = -4.368 ------ Conclusion: since the test stat is not in the reject interval, fail to reject Ho. ====================== Cheers, Stan H.