According to an article published in Z Magazine in 2018, shoppers would spend an average of 25 minutes in supermarkets. Is this claim still valid? A researcher surveyed 50 shoppers in one supermarket and resulted to a mean shopping time of 27.25 minutes with standard deviation of 5.5 minutes. At a .01 level of significance, is the mean shopping time of shoppers in supermarkets different from 25 minutes?

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