Has there been a statistically significant change

Reference no: EM133651075

Question: Researchers are tracking shoppers and want to see if there has been statistically significant increase in the checkout time after incorporating a brief survey of their shopping experience. A reseacher observes 40 shoppers at one of the checkout lines, noting that the mean checkout time during that interval is 143 seconds, with a standard deviation of 18 seconds. They are told by management that the mean checkout time prior to this policy was 137 seconds. Has there been a statistically significant change?

Reference no: EM133651075

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