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This assignment is based on the U.S. Consumer Price Index (CPI) data in the Excel worksheet HW_Data_Period_4.xlsx, which is found on the course website. You will need to use the quarterly observations, which run from 1957:Q1 to 2017:Q2. There are three variables shown in the quarterly spreadsheet: CPI, the log of CPI, and the annualized growth rate in the CPI (inflation).