In a certain supermarket, a sample of 60 customers who used a self-service checkout lane
Chapter 6, Problem 10(choose chapter or problem)
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.
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