Bach Photographs is a photography business with studios in two locations. The owner is interested in monitoring business activity closely at the two locations. Among the factors in which he is interested is whether the mean customer orders per day for the two locations are the same. A random sample of 11 days’ orders for the two locations showed the following data:

The owner wishes to know the difference between the average amount in customer orders per day for the two locations. He has no idea what this difference might be. What procedure would you use under these circumstances? Explain your reasoning.