Sales of Volkswagen's popular Beetle have grown steadily at auto dealerships in Nevada during the past 5 years (see table below). Year Sales 1 455 2 510 3 518 4 570 5 590 a) Forecasted sales for year 6 using the trend projection (linear regression) method are 627.6627.6 sales (round your response to one decimal place). b) The MAD for a linear regression forecast is nothing sales (round your response to one decimal place)