Refer again to the gasoline sales time series data in Table 15.1. a. Using a weight of 1/2 for the most recent observation, 1/3 for the second most recent, and 1/6 for third most recent, compute a three-week weighted moving average for the time series.

Refer again to the gasoline sales time series data in Table 15.1. a. Using a weight of 1/2 for the most recent observation, 1/3 for the second most recent, and 1/6 for third most recent, compute a three-week weighted moving average for the time series. TABLE 15.1 GASOLINE SALES TIME SERIES Week Sales (1000s of gallons) 17 21 19 23 18