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In a study of a new training program’s impact, each employee’s performance is assessed before and after, with improvement classified as 'Improved' or 'Not Improved'. Define the random variable \(Z_i\), where \(i\) is the \(i\)-th employee, to model this study.
Choose the one correct answer:
The random variable \(Z_i\) represents the number of employees in the training program.
The random variable \(Z_i\) represents the improvement status of the \(i\)-th employee, where 1 = 'Improved' and 0 = 'Not Improved'.
The random variable \(Z_i\) represents the duration of the training program.
The random variable \(Z_i\) represents the performance score of the \(i\)-th employee.
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