Studies of automobile demand suggest that unit sales of compact cars depend Principally on their average price and consumers' real personal income. Consider the historical record of sales shown in the table. Sales Average Price Personal income Year (Millions of Cars} {Thousands of Dollars] {EDDE = l) E Elli] HELD 190 20!}? L36 EELS 95 EB 1.94 EM} 9'? EDGE L91] QED Ii} 2!] H} 1.90 241] \")5 Estimate a linear demand equation that best fits the data using a regression program. Comment on the accuracy of your equation. Is this degree of accuracy realistic