A company would like to know if efficiency can be improved through a training course for employees. A sample of employees is taken. The time taken for an employee to complete a task before training and after training is observed.

n=?

degrees of freedom=?

point estimate for before training=?

point estimate for after training=?

Before After Mean 33.1 31.7 Variance 16.81 12.25 Observations 30 30 Hypothesized Mean Difference O df 29 t Stat -2.282 P(T