The average waiting time per customer at the fast food restaurant has been 7.5 minutes. The customer waiting time has the normal distribution. The manager claims that the employ of a new cashier system will reduce the average customer waiting time in the store. Based upon a random sample of 16 customer transactions the mean waiting time is 6.3 minutes and standard deviation is 2 minutes per customer. Test the manager's claim at 5% and 1% significance level tests.