Regina owns a small car dealership and she completed a series of studies to better understand what factors affect the price of cars. In her second study, she wants to know whether car price is affected by the number of doors a car has. So he compares car price with number of doors (there are only two choices: 2-door and 4- door) to see which costs more (alpha of 0.05). Which of the following statements best describe the results of this study? a) There is a significant difference between the two groups, 2-door cars cost more
b) There is a significant difference between the two groups, 4-door cars cost more
c) There is no significant difference between the two groups, two types of cars cost about the same
d) There is no significant difference between the two groups, two types of cars cost different