Reconsider problem 1. Despite some fluctuations from year to year, note that there has been a basic trend upward in the annual demand for copper ore over the past ten years. Therefore, by projecting this trend forward, causal forecasting can be used to forecast demand in future years by letting the year be the independent variable and the demand be the dependent variable. a) Plot the data for the past ten years (years 1 through 10) on a two-dimensional graph with the year on the horizontal axis and demand on the vertical axis. b) Find the formula for the linear regression line that fits this data. c) Plot this line on the graph constructed in part a. d) Use this line to forecast demand next year (year 11). e) Use this line to forecast demand in year 15. f) What does the formula for linear regression line indicate is roughly the average growth in demand per year?

Question "1" as. reference :

The Andes Mining Company mines and ships copper ore. The company's sales manager, Juanita Valdes, has been using the moving-average method based on the last three years of sales to forecast the demand for the next year. However, she has been dissatisfied with the inaccurate forecast being provided by this method. The annual demands (in tons of copper ore) over the past ten years are 382, 405, 398, 421, 426, 415, 443, 451, 446, 464.