An expert criminalist and a recent trainee both participate in a quality assuran
ID: 3391693 • Letter: A
Question
An expert criminalist and a recent trainee both participate in a quality assurance exercise for certification by ASCLD/LAB. They are given a standard sample of alcohol in water at a nominal stated concentration of 15.0000 ppt. Both measure the concentration using 10 replicates with the following results.
Question: Report the 95% confidence limits for both the expert and the trainee.
Run #
Expert
Trainee
1
13.50
14.25
2
13.96
14.46
3
13.16
12.05
4
13.88
13.50
5
14.24
13.32
6
13.95
15.42
7
14.16
13.91
8
14.45
15.63
9
13.81
17.27
10
14.03
14.38
Avg
13.91
14.42
Std Dev
0.37
1.44
Table of Ciritical Values of Student-t
df
90%
95%
99%
1
6.31
12.7
63.7
2
2.92
4.3
9.92
3
2.35
3.18
5.84
4
2.13
2.78
4.6
5
2.02
2.57
4.03
6
1.94
2.45
3.71
7
1.9
2.36
3.5
8
1.86
2.31
3.36
9
1.83
2.26
3.25
10
1.81
2.23
3.17
Infinity
1.64
1.96
2.58
Run #
Expert
Trainee
1
13.50
14.25
2
13.96
14.46
3
13.16
12.05
4
13.88
13.50
5
14.24
13.32
6
13.95
15.42
7
14.16
13.91
8
14.45
15.63
9
13.81
17.27
10
14.03
14.38
Avg
13.91
14.42
Std Dev
0.37
1.44
Explanation / Answer
An expert criminalist and a recent trainee both participate in a quality assuran
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