Software for matched-pairs gives x-bar_d = 1.8, SE = 0.6, df = 9, t* = 2.262 for 95%.
The 95% CI for mu_d is approximately:
- A
(1.80, 2.40)
- Bcheck_circle
(0.44, 3.16)
- C
(1.20, 2.40)
- D
(0.00, 3.60)
Explanation
ME = 2.262 * 0.6 = 1.357. CI = 1.8 ± 1.36 = (0.44, 3.16).