{"id":626,"date":"2024-06-19T09:13:26","date_gmt":"2024-06-19T06:13:26","guid":{"rendered":"https:\/\/sisu.ut.ee\/measurement\/self-test-10-2\/"},"modified":"2024-06-19T09:13:26","modified_gmt":"2024-06-19T06:13:26","slug":"self-test-10-2","status":"publish","type":"page","link":"https:\/\/sisu.ut.ee\/measurement\/self-test-10-2\/","title":{"rendered":"Self-test 10.2"},"content":{"rendered":"
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Here you can test your understanding how the uncertainty component accounting for the random effects can be estimated in practice.<\/p>\n<\/div>\n\n

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1. <\/span>A laboratory wants to estimate the within-lab reproducibility component (component accounting for the random effects) of measurement uncertainty of protein content determination in different foods. For this protein content in a control sample of smoked sausage was determined repeatedly during a time period of almost one year. Every day when this smoked sausage was analysed only one parallel measurement was made. The following results were obtained:
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Week<\/strong><\/td>Result\u00a0(g\/100g)<\/strong><\/td><\/tr>
3<\/td>18.1<\/td><\/tr>
5<\/td>20.5<\/td><\/tr>
11<\/td>18.3<\/td><\/tr>
14<\/td>19.1<\/td><\/tr>
15<\/td>19.3<\/td><\/tr>
27<\/td>20.2<\/td><\/tr>
34<\/td>19.7<\/td><\/tr>
41<\/td>19.5<\/td><\/tr>
42<\/td>18.6<\/td><\/tr>
48<\/td>20.1<\/td><\/tr><\/tbody><\/table>\u00a0
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\r\nPlease calculate the within-lab reproducibility component of uncertainty (please give 2 or 3 decimals). Absolute uncertainties can be used in this case.
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