In the file named Decadeincome.xlsx, you are given a sample of incomes (in thousands of 1980 dollars)

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In the file named Decadeincome.xlsx, you are given a sample of incomes (in thousands of 1980 dollars) for a set of families sampled in 1980 and 1990. Assume that these families are representative of the whole United States. Some Republicans claim that the country was better off in 1990 than in 1980 because the average income increased. Do you agree?

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