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The mean arrival rate of flights at O'Hare Airport in marginal weather is 195 flights per hour with a historical standard deviation 14 Tights. To Increase arrivals. a new air trac control procedure is implemented in the next 30 days of marginal weather, the mean arrival rate is 205 nights per hour. 214 235 214 217 194 188 197 203 207 193 212 199 216 189 184 204 188 210 187185 229 213 206 192 213 200 234 205 224 198 D Click here for the Excel Data File Set up a right-tailed decision rule at a- .025 to decide whether there has been a (a)significant increase in the mean number of arrivals per hour. Choose the appropriate hypothesis. .. 195. reject <1960 b. MEU < 195. reject > 1960 c. HO V 195. reject Mofz<1960 d. NO: 195, relect >> 1.960 (b-1) Calculate the test statistic (Round your answer to 2 decima Test statistic O What is the conclusion? There has been a significant increase in the average number of flight departures There has not been a significant increase in the average number of flight departures Would the decision have been different if you used a-01? a. No. 21-233 and 3.91 233. So we would still have concluded that there has been b. Yes. 201 - 2.33 and 3.91 > 233. so we would still have concluded that there is no evidence to indicate a significant increase No (e) What assumptions are you making. If any? We have assumed that the type of distribution does not matter We have assumed a normal population or at least one that is not badly skewed We have assumed that the data follow a uniform distribution

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Solution:

hic mean arrival rate of lights at O'Hare Airport in marginal Weather is 195 mights per hour with a historical standard deviation of 14 flights. To increase arrivals. a new air traffic control procedure is implemented in the next 30 days of marginal weather the mean analrate is 2015 Nights per hour 2.14 2.17 197 235 19:4 203 2.14 188 207 193 188 192 212 210 213 1992:16 189 194 204 187 186 229 2.13 206 200 234 205 224 19.8 E Click here for the Excel Data File Set up a rohttailed decision rule at a - .025 to decide whether there has been a [ignificant ince in the men number of per hour. Chool the appropriate hypothesis. U 195. reject fz1960 bHEU < 195. reject Z 1960 C. HO 195. reject Holtz 1960 (b-Calculate the static (Round your answer to ascimmall placii. Test Statistic 3.91 x-u 205-195 -=3.91 What is the conclusion n There has been ignificant increase in the verge number of flight There has not been significant increase in the average number of flight

Would the decision have been different if you used a = 01? a. No 20 -2.33 and 3.9112.38. so we would still we concluded that there has been evidence to indicate a significant increase. No What assumptions are you making. If any? We have assumed normal population or at least one that is not bialy We have assumed that the data follow a uniform distribution.