单项选择题
A.3.50±1.96×0.50 B.3.50±1.96×0.50/ C.3.50±1.96×0.50/16 D.3.50±t0.05,15×0.50/ E.3.50±t0.05,15×0.50/16
A.0.607 B.0.303 C.0.076 D.0.013 E.0.002
A.0.607 B.0.303 C.0.402 D.0.393 E.0.600