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 a = .05 to see if the mean daily...

Extracted text: 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 a = .05 to see if the mean daily errors decreased significantly Trainee T1 T2 T3 T4 T5 T6 T7 Week 1 5.1 3. 12.1 6.2 11.5 7.8 2.2 Week 2 3.2 2.2 8.7 7.7 9.4 7.8 3.1 The test statistic is; O 1.25 O 1.75 O 0.87 O 0.79