Mathematics, 26.09.2019 22:30 jasmin2344
In a certain supermarket, a sample of 60 customers who used a self-service checkout lane averaged 5.1 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 2.7 minutes. can you conclude that the mean checkout time is less for people who use the self-service lane?
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