The following data show the number of rental cars in service for three rental car companies: Hertz, Avis, and Dollar, over a four-year period.

a. Construct a time series graph for the years 1 to 4 showing the number of rental cars in service for each company. Show the time series for all three companies on the same graph.

b. Comment on who appears to be the market share leader and how the market shares are changing over time.

c. Construct a bar chart showing rental cars in service for Year 4. Is this chart based on cross-sectional or time series data?

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Cars in Service (1000s) Company Hertz Dollar Avis Year 1 ear ear Year 4 327 167 204 311 140 220 286 106 300 290 108 270