The owner of a five deli shop has recently hired a new manager for one of her locations who claims to have reduced customer waiting time at his location. If true, the owner would like to have the same changes applied in the other four locations. The owner has asked for data which supports the claim of lower waiting time. The store manager presented the past data on customer waiting time during peak demand hours and compared it to data gathered continuously over five days under the new procedure. What kind of a test will it be for testing the difference