(a) In Excel, convert each time-series variable into index numbers (1990 = 100). (b) What...

(a) In Excel, convert each time-series variable into index numbers (1990 = 100). (b) What is the 2004 index value for each time series? What does this tell you? (c) Plot all four series of index numbers on the same graph. Describe what you sec. (d) What is the advantage of using index numbers in plotting and comparing these data over time?  Prisons

Source: Statistical Abstract of the United Stairs. 2007. p. 209.