Problem 10E

In a certain supermarket, a sample of 60 customers who used a self-service checkout lane averaged 5.2 minutes of checkout time, with a standard deviation of 3.1 minutes. A sample of 72 customers who used a cashier averaged 6.1 minutes with a standard deviation of 2.8 minutes.

a. Can you conclude that the mean checkout time is less for people who use the self-service lane?

b. Can you conclude that if everyone used the self- service lane, that the mean checkout time would decrease? Consider the number of items checked out when formulating your answer.

CH9 Management of Quality Defining quality: Q = P – E QUALITY=PERFORMANCE (or PERCEPTIONS) – EXPECTATIONS If “what I perceived or what I saw” Performance is > expectations, then the quality is positive If performance is < expected, then quality is negative That’s why a lot of companies say “we will meet or exceed your expectations” BUT if you meet expectations, then you’ll have P=E, Q=0. Neutral. Meet P=E, Q=0. Exceed P>E, Q=0. Dimensions of Quality: Product Quality= performance, aesthetics, special features, conformance (Toyota is the main example for conformance. All the cars are rolled out exactly the same, you should be able to go to the lot and pick any out and it’ll be a quality product), reliability, durability, serviceabili