3. Ten weeks of data on the Commodity Futures Index are 7.35, 7.40, 7.55, 7.56, 7.60, 7.52, 7.52, 7.70, 7.62, and 7.55 4 a. Which of the following is a time series plot? 7.8 7.7 7.6 7.5 7.4 7.3 7.2 7.1 7.8 7.7 7.6 x 7.5 7.4 7.3 7.2 7.1 6. 0 1 234 5 6 789 10 Week 0 1234 5 6 789 10 Week 7.7 7.6 x 7.5 7.3 7.2 7.1 0 1 23 45 6 78 9 10 Week time series plot #a What type of pattern exists in the data? horizontal