A marketing researcher at a computer company did a study examining user satisfaction with two operating systems.A total of 300 users were surveyed on the type of operating system used and their satisfaction with it.Use the following data set to answer questions 6-14: 
Given that it is impossible for a user to be satisfied and not satisfied with system 10 at the same time,these two events are called ___________________________.
Definitions:
Skinfold Thickness
A measure used to estimate body fat percentage by pinching the skin and underlying fat away from muscle.
Body Fat
The portion of the human body composed of fat tissue, which serves as energy storage, insulation, and protection of organs.
Triceps Muscle
A large muscle on the back of the upper arm that is responsible for the extension of the elbow joint.
Schemas
Mental frameworks that organize concepts and information.
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