measuring intracranial pressure (measured in millimeters of mercury [mm Hg]) for a group of traumatic-brain-injury patients on breathing support (X₁) compared a group of traumatic-brain-injury patients not on breathing support (X₂).
Format answer as:
2.21 or -2.21
Group 1 X₁ Group 2 X₂
Pt 1 11 Pt. 11 15
Pt. 2 9 Pt. 12 14
Pt. 3 15 Pt. 13 12
Pt. 4 8 Pt. 14 13
Pt. 5 15 Pt. 15 10
Pt. 6 8 Pt. 16 8
Pt. 7 9 Pt. 17 16
Pt. 8 15 Pt. 18 11
Pt. 9 13 Pt. 19 12
Pt. 10 15 Pt. 20 12