Hybrid cars have gained popularity because of their fuel economy and the uncertainty regarding the price of

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Hybrid cars have gained popularity because of their fuel economy and the uncertainty regarding the price of gasoline. All automakers, including the Ford Motor Co., have planned to significantly expand their hybrid vehicle lineup (CNN.com, November 9, 2005). The following table contains quarterly sales of Ford and Mercury hybrid cars.

Hybrid cars have gained popularity because of their fuel economy

a. Plot the preceding series. Comment on the trend and seasonal variation in the sales of hybrid cars.
b. Compute and interpret the seasonal indices.

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