Exactitud (2).pdf

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1

1

Precisión y Exactitud

1

↓ ↓

↓ ↑

↑ ↓

↑ ↑

Error relativo 

xobtenido  xverdadero x 100 xverdadero

9

μ

μ

tcalculada 

NIST SRM 144a

NIST SRM 144a

n=4

27,6 29,3 28,1 28,9

28,5 (±0,8)

x  valor conocido s

ttabulada (n-1=3) = 3,182

Se: 30,1 (±0,9) ng/mL

n

28,5  30,1 0,8

4  4,000

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