Mathematics, 01.08.2019 05:20 tcchef6
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.
Answers: 3
Mathematics, 21.06.2019 22:30, 713073
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Mathematics, 21.06.2019 23:30, jadynsantiago
Ana earns 2.5% simple interest on $2,000 in her savings account. she does not make any deposits or withdrawals. after 3 years, how much interest will ana have earned on her savings account?
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Mathematics, 22.06.2019 00:00, kotetravels10
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Mathematics, 22.06.2019 00:30, jamiej231984
Two cities a and b are 1400km apart and lie on the same n-s line. the latitude of city a is 23 degrees. what is the latitude of city b. the radius of the earth is approximately 6400km.
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In a certain supermarket, a sample of 60 customers who used a self-service checkout lane averaged 5....
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