a. The negative "Door" coefficient indicates that more doors on a car reduce the car's mileage. b. The "Sound" coefficient is unexpectedly negative, suggesting that ca rs with upgraded speakers are associated with a lower selling price. c. The "Mileage" coefficient is unexpectedly negative, since higher miles driven should be associated with a higher selling price. d. The "Mileage" coefficient is unexpectedly small compared to the others, suggesting that miles driven is unimportant in the selling price of a used car. Question 19 Not yet answered Marked out of 1.00 Flag question Question text The results from the t t-statistics and p p-values suggests that Select one: a. Only the coefficient for "Liter" is statistically insignificant. All of the other coefficients are statistically significant at the 1% level. b. Mileage, Liter, Doors, and Sound are all insignificant since the t t-stats are negative. c. Mileage, Cylinder, Doors, Cruise, and Leather are all insignificant since the p p-values are zero, meaning unrelated to car price. d. "Liter" is the only statistically significant estimate since it's p p-value is 36.4%. Question 20 Not yet answered Marked out of 1.00 Flag question Question text Which of the following statements is correct, based on the regression results above? Select one: a. Cars with cruise control have about 6,300 fewer miles on them than cars without cruise control, everything else equal. b. Since the "Liter" coefficient is insignificant, the true effect is actually +787.22 and not -787.22 c. Every additional mile driven increases the price of the car by $0.17 d. Having four doors instead of two is associated with more than a $3,000 lower price, everything else equal