Question: The mean arrival rate of flights at O’Hare Airport in marginal weather is 195 flights per hour with a historical standard deviation of 13 flights. 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 flights 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? Flights

210         215         200         189         200         213         202         181         197         199

193         209         215         192         179         196         225         199         196         210

199         188         174         176         202         195         195         208         222         221

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