An online flight company makes the following claim: The average cost of a flight with us to Palma is just £89 (including all taxes and charges!) A rival flight company decides to test their claim. A sample of 14 customers is taken. The mean cost of a flight to Palma from this sample is £99 with a standard deviation of £18. Perform an appropriate hypothesis test to see if the claim made by the online flight company is substantiated (use a two-tailed test)
