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.For the next 30 days of marginal weather, the number of flights is recorded in the table below:

210215200189179196193209215192202195199188174176197199200213202181196210225195222199208221

At a 5% significance level, has the variability in flights per hour changed relative to before the new procedure was implemented?