where rfi is the recorded failure load of the ith test sample.
The sample standard deviation, s, is defined as:
s = the square root of the quantity of the sum from i = 1 thru n
for (rfi - r-2) divided by (n - 1)
(4)
The minimum value of the sample standard deviation, s, permitted
to be employed in Equation (2) is:
s = 0.145 rs
(5)
This assures a sample standard deviation no better than observed
for the general population of tempered glass.
b.
Additional sampled determination: The following equation can be
used by tester to determine if additional test samples are
justified. If:
r- =< rs + sB
(6)
then with 90% confidence, the design will not prove to be adequate
with additional tests. Obtain rejection coefficient, B, from
Table 1.
Table 1.
Statistical Acceptance and Rejection Coefficients
Number of Window
Acceptance
Rejection
Assemblies
Coefficient
Coefficient
n
A
B
2
4.14
.546
3
3.05
.871
4
2.78
1.14
5
2.65
1.27
6
2.56
1.36
7
2.50
1.42
8
2.46
1.48
9
2.42
1.49
10
2.39
1.52
11
2.37
1.54
12
2.35
1.57
13
2.33
1.58
14
2.32
1.60
15
2.31
1.61
16
2.30
1.62
17
2.28
1.64
18
2.27
1.65
19
2.27
1.65
20
2.26
1.66
21
2.25
1.67
22
2.24
1.68
23
2.24
1.68
24
2.23
1.69
25
2.22
1.70
30
2.19
1.72
40
2.17
1.75
50
2.14
1.77
SECTION 08581
Page 13
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