The file GNP.xls (available on the companion website) contains quarterly GNP data for the United States in

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The file GNP.xls (available on the companion website) contains quarterly GNP data for the United States in the years 1970-2012. Try to predict next quarter's GNP from last quarter's GNP. What is the R? Does this mean you are good at predicting next quarter's GNP?

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