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Appendix A  Relative Accuracy Equations

Relative Accuracy Equations

Equation ID

Equation

Variables

Arithmetic Mean Difference

Eq. A-7

d = Diff = RM - M for each run

n  = Number of runs

Sd  = Standard deviation

t0.025 = t value (see table)

CC = Confidence coefficient

RM = Arithmetic mean of reference method values

RA = Relative accuracy

Standard Deviation

Eq. A-8

Confidence Coefficient

Eq. A-9

Relative Accuracy

Eq. A-10

Table of T-values

n-1

t0.025

n-1

t0.025

n-1

t0.025

1

12.706

12

2.179

23

2.069

2

4.303

13

2.160

24

2.064

3

3.182

14

2.145

25

2.060

4

2.776

15

2.131

26

2.056

5

2.571

16

2.120

27

2.052

6

2.447

17

2.110

28

2.048

7

2.365

18

2.101

29

2.045

8

2.306

19

2.093

30

2.042

9

2.262

20

2.086

40

2.021

10

2.228

21

2.080

60

2.000

11

2.201

22

2.074

>60

1.960

Part 75 Field Audit Manual - July 16, 2003                                                                                                       Page A-28

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