The federal funds rate is the interest rate charged by banks when banks borrow “overnight” from each other. The file titled The Fed contains the federal funds rates for the period 1955–2015 (source: “Effective federal funds rate,” Economic Research, Federal Reserve Bank of St.

Louis, https://research.stlouisfed.org, Mar. 7, 2016).

Construct a time-series plot for the federal funds rates for the period 1955–2015.