3. A stock trading company institutes a new system, in order to reduce the trade time of stock. The mean waiting time under the specific conditions with the previous system was 6.1 minutes. A sample of 34 stock trades is taken. The times are measured at widely separated times so to eliminate the possibility of dependent observations. The resulting sample mean is 5.043 and the sample standard deviation is 2.266 Test the null hypothesis of no change against an appropriate research hypothesis using = .10. (Take )