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more and more customers are choosing store brand products over national brand products to save money....

more and more customers are choosing store brand products over national brand products to save money. the president of a company that produces national brand coffee claims that 40% of the customers prefer to buy national brand coffee. A random sample of 700 customers who buy coffee showed that 259 of them buy national brand coffee. Based on a 1% significance level, can you conclude that the percentage of customers who buy national brand coffee is different from 40%?
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