Consider the following time series: Quarter Year 1 71 49 58 78 a. Construct a time series plot. b. What type of pattern exists in the data? Quarter 1 2 Year 1 1690 940 2625 2500 Year 2 2. The quarterly sales data (number of copies sold) for a college textbook over the past three years follow. a. Construct a time series plot. b. What type of pattern exists in the data? 41 60 81 Year 3 62 51 53 72 Year 2 1800 900 2900 2360 Year 3 1850 1100 2930 2615