Internal quality control sample of blood

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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

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.

Reference no: EM131365778

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