The following data present the number of computer units sold per day by a sample of 6 salespersons before and after a bonus plan was implemented. 
At 95% confidence, test to see if the bonus plan was effective. That is, did the bonus plan actually increase sales? Let d = Before - After.
Definitions:
Preliminary Screening Interviews
Initial interviews conducted to evaluate a candidate's basic qualifications and potential fit for a position before proceeding to more in-depth interviews.
Hiring Process
The series of steps an organization follows to identify, recruit, select, and onboard a new employee.
Structured Interview
A structured interview is a method of questioning where all candidates are asked the same predefined set of questions in the same order, ensuring consistency in the hiring process.
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