QUESTION #6: Consider the following time series showing smartphone sales over the last 4 years. Year 1 2 3 4 Quarter 1 234123412341234 Sales (1000s) 4.8 4.1 6.0 6.5 5.8 5.2 6.8 7.4 6.0 5.6 7.5 7.8 6.3 5.9 8.0 8.4 1) Construct a time-series plot (X-Y chart). What type of pattern exists in the data? 2) Use the forecasting methods described in Lessons 3C and 3D to compute the forecasts for each quarter of Year 5. Use Method 1 to estimate the seasonal factors.