An internal quality control sample of blood, used for checking the accuracy of blood alcohol determinations, contains
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Question:
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 ml−1) |
1 | 79.8 |
2 | 80.2 |
3 | 79.4 |
4 | 80.3 |
5 | 80.4 |
6 | 80.1 |
7 | 80.4 |
8 | 80.2 |
9 | 80.0 |
10 | 79.9 |
11 | 79.7 |
12 | 79.6 |
13 | 79.5 |
14 | 79.3 |
15 | 79.2 |
16 | 79.3 |
17 | 79.0 |
18 | 79.1 |
19 | 79.3 |
20 | 79.1 |
Plot the Shewhart chart for the mean, and the CUSUM chart, for these results, and comment on the outcomes.
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