Question: An independent rating service is trying to determine which of two hamburger stands has quicker service. Over a period of 16 randomly selected times the average waiting period at Burger Queen is 4.8 min with standard deviation 2.0 min. The average waiting period at McGregor over a period of 14 randomly selected times is 5.2 min with standard deviation 1.8 min. Using a 5% level of significance, can we say there is a difference in the average waiting time at Burger Queen and McGregor? (Assume variances unknown, but equal and waiting times are normal)