chapter 1

Chapter 7: Statistical Intervals Based on a Single Sample29.a. t 2. 228. 025,10=b. t 2. 086. 025,20=c. t 2. 845. 005,20=d. t 2. 678. 005,50=e. t 2. 485. 01,25=f. − t = 2. 571. 025,5−30.a. t 2. 228. 025,10=b. t 2. 131. 025, 15=c. t 2. 947. 005,15=d. t 4. 604. 005,4=e. t 2. 492. 01,24=f. t 2. 712. 005,37≈31.a. t 1. 81205 ,10=b. t 1. 753. 05,15=c. t 2. 602. 01,15=d. t 3. 747. 01,4=e. ≈ t 2. 064. 025,24=f. t 2. 429. 01,37≈32. d.f. = n – 1 = 7, so the critical value for a 95% C.I. is t 2. 365 . The interval is⎛ 3.1⎞30 .2=⎝ 8 ⎠( 2.365) ⎜ ⎟ = 30.2 ± 2.6 ( 27.6,32.8). 025,7=± .226