Show transcribed image text The mean arrival rate of flights at O'Hare Airport in marginal weather is 195 flights per hour with a historical standard deviation of 17 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 201 flights per hour 223 190 214 196 178 184 183 217 215 175 217 222 181 215 213 207 216 193 224 215 220 176 183 188 186 20 219 185 178 208 ata (a) Set up a nght-tailed decision rule at α = .025 to decide whether there has been a significant increase in the mean number of arrivals per hour. Choose the appropriate hypothesis. a. b〠c· d. Hl: μ > 195, reject H, if z 1.960 (b-1) Calculate the test statistic. (Round your answer to 2 decimal places.) Test statistic (b-2) What is the conclusion? OThere has not been a significant increase in the average number of flight departures. OThere has been a significant increase in the average number of flight departures (b-3) Would the decision have been different if you used α.01? a. No, z01-2.33 and 1.93 2.33, so we would still have concluded that there is no evidence to indicate a significant increase. increase in the average number of flight departures O No D. Yes, z01-2.33 and 1.93 2.33, so we would still have concluded that there has been a significant O Yes (c) What assumptions are you making, if any? O We have assumed that the type of distribution does not matter. O We have assumed a normal population or at least one that is not badly skewed. O We have assumed that the data follow a uniform distribution.
The mean arrival rate of flights at O'Hare Airport in marginal weather is 195 flights per hour with a historical standard deviation of 17 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 201 flights per hour 223 190 214 196 178 184 183 217 215 175 217 222 181 215 213 207 216 193 224 215 220 176 183 188 186 20 219 185 178 208 ata (a) Set up a nght-tailed decision rule at α = .025 to decide whether there has been a significant increase in the mean number of arrivals per hour. Choose the appropriate hypothesis. a. b〠c· d. Hl: μ > 195, reject H, if z 1.960 (b-1) Calculate the test statistic. (Round your answer to 2 decimal places.) Test statistic (b-2) What is the conclusion? OThere has not been a significant increase in the average number of flight departures. OThere has been a significant increase in the average number of flight departures (b-3) Would the decision have been different if you used α.01? a. No, z01-2.33 and 1.93 2.33, so we would still have concluded that there is no evidence to indicate a significant increase. increase in the average number of flight departures O No D. Yes, z01-2.33 and 1.93 2.33, so we would still have concluded that there has been a significant O Yes (c) What assumptions are you making, if any? O We have assumed that the type of distribution does not matter. O We have assumed a normal population or at least one that is not badly skewed. O We have assumed that the data follow a uniform distribution.
