consider the following time series. 1 2 3 4 5 6 7 120 110 100 96 94 92 88 excel file: data17-19.xls a. construct a time series plot. 1. 2. 3. - select your answer - what type of pattern exists in the data? - select your answer - b. develop the linear trend equation for this time series (to 1 decimal). c. what is the forecast for (to 1 decimal)?