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the acceptable time for answering the phone at a call center is 2 0 seconds. In a sample of 7 5 0 , 2 5

the acceptable time for answering the phone at a call center is 20 seconds. In a sample of 750,250 were answered within 20 seconds. With 90% confidence level we can say that the true proportion of calls that are answered within 20 seconds is

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