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:
Sales Forecast Approach
A method used to estimate the future sales of a product or service based on historical data, market trends, and economic conditions.
Equalized Workload Method
A management strategy where tasks and responsibilities are distributed among team members in a way that ensures an equitable share of workload and prevents burnout.
Market Potential
The maximum total sales of a product or service that all sellers could achieve in a specific market segment during a certain time period, under ideal conditions.
Sales Management
The practice of directing and controlling sales operations and teams to achieve set sales targets and objectives.
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