The mean arrival rate of flights at O\'Hare Airport in marginal weather is 195 f

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 14 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 205 flights per hour.

Calculate the test statistic. (Round your answer to 2 decimal places.)

The mean arrival rate of flights at O'Hare Airport in marginal weather is 195 flights 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 arrival rate is 205 flights per hour.

Explanation / Answer

here std error of mean =std deviaiton/(n)1/2 =2.556

hence test stat z=(X-mean)/std error =(205-195)/2.556 =7.8246

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