The mean arrival rate of fights at O'Hare Airport in marginal weather is 195 fights per hour with a historical standard deviation of 13 fights. To increase arrivals, a new air traffic control procedure is implemented. In the next 30 days of marginal weather, the mean arrival rate is 200 fights per hour.
(a) Set up a right-tailed decision rule at α = .025 to decide whether there has been a significant increase in the mean number of arrivals per hour.
(b) Carry out the test and make the decision. Is it close? Would the decision be different if you used α = .01?
(c) What assumptions are you making, if any?

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