The mean arrival rate of flights at Salt Lake City 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 198 flights per hour. 176 193 202 222 222 192 212 211 212 210 189 203 191 207 188 184 213 195 196 175 188 190 222 201 211 195 178 188 194 180 Click here for the Excel Data File (a) Set up a right-tailed decision rule at a = .025 to decide whether there has been a significant increase in the mean number of arrivals per hour. Choose the appropriate hypothesis. a. H1: M > 195, reject H1 if z 1.960 C. Ho: M 2 195, reject Ho if z 1.960 O a Ob O c Od (b-1) Calculate the test statistic. (Round your answer to 2 decimal places.) Test statistic (b-2) What is the conclusion? There has not been a significant increase in the average number of flight departures. O There has been a significant increase in the average number of flight departures.(b-3) Would the decision have been different if you used a = .01? a. No, Z. 01 = 2.33 and 1.17