The table below shows the mean number of daily errors by air traffic controller trainees during the first two weeks on the job.We want to perform a paired t-test at α = .05 to see if the mean daily errors decreased significantly. 
What would be the degrees of freedom for the appropriate test?
Definitions:
Emotion
A complex reaction pattern, involving experiential, behavioral, and physiological elements, by which an individual attempts to deal with a personally significant matter or event.
Substantia Nigra
A region of the brain involved in movement and reward, known for its role in disorders such as Parkinson's disease.
Dopamine
A neurotransmitter in the brain associated with pleasure, movement, and the reward system.
Neurodegenerative Disease
A disorder characterized by the progressive loss of nerve cells and function, leading to degeneration in mental and physical abilities.
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