TABLE 4
CONFIDENCE LIMITS AS A PERCENT OF MEAN CONCENTRATION
BASED ON ASSUMED COEFFICIENT OF VARIATION OF 0.7
NUMESR OF SAMPLES
PROBABLE ERROR
STRATIFICATION
MEAN CONCENTRATION
PER
+ % of
5
63
10
dd
20
31
30
26
20
20
60
18
ho
22.
1h
.
100
200
10
500
6.3
1000
kok
Confidence Limit =
PE, =
2(0.7)
vn
(as a proportion of the mean)
4/