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 selfservice lane? b) Can you conclude that if everyone used the selfservice lane, that the mean checkout time would decrease? Consider the number of items checked out when formulating your answer.
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 selfservice lane? b) Can you conclude that if everyone used the selfservice lane, that the mean checkout time would decrease? Consider the number of items checked out when formulating your answer.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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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 selfservice lane? b) Can you conclude that if everyone used the selfservice lane, that the mean checkout time would decrease? Consider the number of items checked out when formulating your answer.
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