Many grocery stores have self-checkout scanners so that customers can check out faster. Some customers are concerned that the scanners will be wrong and overcharge them. However, the manufacturer of the scanners indicates that scanners will err in favor of the customer most of the time. A random sample of 500 customers resulted in the following contingency table: Price Charged Undercharged Overcharged Correct Price Self Checkout 20 15 Checkout Method 200 Employee Checkout 10 30 225 Using a -5%, can we conclude that the price charged using scanners is independent of whether a customer checks themselves out or if a store employee checks them out?

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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Many grocery stores have self-checkout scanners so that customers can check out faster.
Some customers are concerned that the scanners will be wrong and overcharge them.
However, the manufacturer of the scanners indicates that scanners will err in favor of the
customer most of the time. A random sample of 500 customers resulted in the following
contingency table:
Price
Charged
Undercharged
Overcharged
Correct Price
Self Checkout
20
15
Checkout Method
200
Employee Checkout
10
30
225
Using a = 5%, can we conclude that the price charged using scanners is independent of
whether a customer checks themselves out or if a store employee checks them out?
Transcribed Image Text:Many grocery stores have self-checkout scanners so that customers can check out faster. Some customers are concerned that the scanners will be wrong and overcharge them. However, the manufacturer of the scanners indicates that scanners will err in favor of the customer most of the time. A random sample of 500 customers resulted in the following contingency table: Price Charged Undercharged Overcharged Correct Price Self Checkout 20 15 Checkout Method 200 Employee Checkout 10 30 225 Using a = 5%, can we conclude that the price charged using scanners is independent of whether a customer checks themselves out or if a store employee checks them out?
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