From Table A.2
Ny = 10
X, = 32.76 x 107
x 2%
3.28 10%
Nx
'
Ax = 7.15 x 1078
Thus
og = 0.28 x 10
Table A.2-—-DATA FROM INDENTER GAUGES
Diameter,
Diameter’
ax = Xi;-X
(« 104)
A& & 10°)
0.13
2.62
0.01
0.92
0.15
1.10
Island
Gauge No.
Bogallua
1
2
3
4
5
7
0.0171
0.0129
0.0179
0.0206
0.0170
0.0208
2.92
1.66
3.20
4.24
2.89
4.33
~0.36
—-1.62
—0.08
0.96
~ 0.36
1.05
10
21
0.0173
0.0154
2.99
2.37
—0.29
-0.91
8
9
in.
(X;) « 10*)
0.0205
0.0199
4.20
3.96
0.92
0.68
0.85
0.46
0.08
0.83
Pa
4y=Y-Y
Engebi
(¥,) & 104)
(&« 10*)
ay & 10°)
11
12
13
0.0145
0.0182
0.0214
2.10
2.31
4.58
-1.15
~ 0.94
1.33
1.32
0.88
1.77
15
0.0189
3.57
0.32
0.10
14
16
17
18
20
0.0214
4.58
0.0180
0.0168
0.0175
0.0174
3.24
2.76
3.06
3.03
1.33
~0.01
~0.45
—0.19
- 0.22
1.77
0.00
0.24
0.04
0.05
Likewise, using Yj to represent the square of the diameter for the other statistical set (readings from the gauges on Engebi), the standard deviation from the mean becomes
og Vee Ly 0.20 x 10
=
esby =
~4
Therefore
X = (3.28 + 0.28) x 1074
and
¥ = (3.25 + 0.29) x 1074
66