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Mathematics, 05.05.2020 04:15 miguelsanchez1456
5) 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. Suppose it is reasonable to assume that the two variance of the two groups are the same. Can you conclude that the mean checkout time is less for people who use the self-service lane
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5) In a certain supermarket, a sample of 60 customers who used a self-service checkout lane averaged...
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