The mean arrival rate of flights at OHare Airport in margina

The mean arrival rate of flights at O\'Hare Airport in marginal weather is 195 flights per hour with a historical standard deviation of 15 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 197 flights per hour. (b-1) Calculate the test statistic. (Round your answer to 2 decimal places.) Test statistic

Solution

samlpe mean= 197

sample standard deviation =14.55311

So the test statistic is

Z=(xbar-mu)/(s/vn)

=(197-195)/(15/sqrt(30))

=0.73