57 
TABLE 4.11:3. 
Investigation (a). Correlation coefficients between blood alcohol concentration and standard deviation. 
Operator 
nr 
Date 
s 
X 
s 
y 
i 
S P 
1 
11/2 
0.54 
0.67 
0.44 
1 
13/2 
0.20 
0.32 
0. 59 
2 
12/2 
0.46 
0.07 
0.92 
2 
18/2 
-0. 53 
-0. 33 
0.02 
3 
12/2 
0.41 
0. 09 
0.17 
3 
18/2 
-0.49 
-0.59 
-0.08 
4 
11/2 
0.14 
4 
11/2 
0.30 
4 
13/2 
0.10 
4 
18/2 
0. 33 
TABLE 4.11:4. 
Investigation (b). F-values testing differences of pooled standard deviations. (F equals alcohol-variance 
divided by nonalcohol-variance). 
Operator 
nr 
F 
Test 
1 
0.96 
Not significant 
2 
1.42 
Almost significant 
3 
0.97 
Not significant 
4 
1.00 
Not significant 
4 
0.73 
Significant