An investigation carried out to study purchasers of luxury automobiles reported data on a number of different attributes that might affect purchase decisions, including comfort, safety, styling, durability, and reliability (“Measuring Values Can Sharpen Segmentation in the Luxury Car Market,” Journal of Advertising Research [1995]: 9–22). Here is summary information on the level of importance of speed, rated on a seven-point scale:

In addition, SSE = 459.04. Carry out a hypothesis test to determine if there is sufficient evidence to conclude that the mean importance rating of speed is not the same for owners of these three types of cars.

Transcribed Image Text:

Type of Car Sample size Sample mean rating American German Japanese 58 38 59 3.05 2.87 2.67