Medium

B₁₂ (μg) in B₁₂ ampoule sample

Determined

B₁₂ (μg)

$\overline{x}$

s

$\overline{x}\pm ts/\sqrt{N}$

1.0 M NH₃/NH₄Cl buffer (pH = 9.8)

1000

976

1016

990

1016

999

24

999 ± 24