The file S02_19.xlsx lists annual percentage changes in the Consumer Price Index (CPI) from 1914 through 2008. Find and interpret the first and third quartiles and the inter-quartile range for these annual percentage changes. Discuss whether these are even meaningful summary measures for this time series data set. Suppose that the data set listed the actual CPI values, not percentage changes, for each year. Would the quartiles and inter-quartile range be meaningful in this case? Why or why not?
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