The аverаge custоmer wаiting time at a fast fооd restaurant has been 7.5 minutes. The customer waiting time has a normal distribution. The manager installs a new system and checks if the use of the new system will decrease average customer waiting time in the store. Based on a random sample of 16 customer transactions the mean waiting time is 6.3 minutes and the population standard deviation is 2 minutes per customer. What is the p-value?