A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago.A sample of final examination scores from students enrolled today and from students enrolled five years ago was taken.You are given the following information. 
The point estimate for the difference between the means of the two populations is
Definitions:
Sensory Apparatus
The complex of sensory organs and parts an organism uses to detect changes in its environment.
Vestibular Receptors
are sensory receptors in the inner ear responsible for detecting movement and changes in the position of the head, important for balance and spatial orientation.
Body Position
The posture or arrangement of the body and its limbs, which can influence various physiological and psychological processes.
Movements
Any physical activity or change in position or posture, generated by the body's musculoskeletal system.
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