all data needed to complete this assignment are located in the HW4 Data.xlsx file posted on Moodle. You are chief demand forecaster at the friendly neighborhood electric utility, and are trying to build a model that will predict "peak system demand" in the year 2024. To start with, you have a bunch of historical information for the past 20 years, including peak demand data and records of four other variables that might help explain how peak demand changes year-to-year. Note that 1 GW = 1000 MW