PT) 2 0.3 P(T>tan)=a 3 .25 0.2 0.15 al2 0.1 a2 . 0.05 -t2 tar2 P(T>2.2281)=0.025 P(T>2.2281)=0.05 →t.025(10)=2.2281( ) α α α α > = > = / 2 / 2 2 ( ) P T t P T t -3 -2 -1 1 2 3 0.05 0.1 0.15 0.2 0.25 0.3 0.35 tα/2 -tα/2 • • ( ) ( 2.2281) 0.05 2.2281 0.025 > = > = P T P T α/2 α/2 (10) 2.2281 ⇒ t0.025 =