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Please judge your own answer using the following points:

- Did you notice that for lab 3 the within lab variability was much higher than in other labs? This could be a reason not to trust the results of this lab. Or ask this lab for their quality assurance system.

- Did you also notice that lab 3 did use the same method (the Folch extraction) for all products? In case of biscuits this method is not optimal because occluded fats can not be completely extracted.

- Did you notice that lab 3 reported a higher total fat contents than most other labs (at least for a few products). Together with the low precision this could be reasons not to trust the results.

Imagine that the laboratory that provided the fat analysis of the biscuits was laboratory no 3 in this inter-laboratory trial. Would you trust the results? Explain your answer.

Below you find the results of an interlaboratory trial in which the fat contents of several products is determined by various experienced food labs. Study the results and answer the following questions.