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A study of customer satisfaction was done in Toronto and compared with Vancouver. Both samples surveyed 225 customers and found that the standard error for

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A study of customer satisfaction was done in Toronto and compared with Vancouver. Both samples surveyed 225 customers and found that the standard error for Toronto was 4 and 3 for Vancouver. In addition most customers lived in their homes with their puppies, watched television and ate potato chips. What is the standard error of the difference of the two means

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