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An internal quality control sample of blood, used for checking the accuracy of blood alcohol determinations, contains 80.0 mg 100 ml-1 of ethanol. Successive daily measurements of the alcohol level in the sample were made using four replicates. The precision (process capability) of the method was known to be 0.6 mg 100 ml-1. The following results were obtained:
Day
Concentration (mg 100 MI-')
1
79.8
2
80.2
3
79.4
4
80.3
5
80.4
6
80.1
7
8
9
80.0
10
79.9
11
79.7
12
79.6
13
79.5
14
79.3
15
79.2
16
17
79.0
18
79.1
19
20
Plot the Shewhart chart for the mean, and the cusum chart, for these results, and comment on the outcomes.
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