Safe food Some food retailers propose subjecting foodto a low level of radiation in order to improve safety, butsale of such “irradiated” food is opposed by many people.Suppose a grocer wants to find out what his customersthink. He has cashiers distribute surveys at checkout andask customers to fill them out and drop them in a box nearthe front door. He gets responses from 122 customers, ofwhom 78 oppose the radiation treatments. What can thegrocer conclude about the opinions of all his customers?

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