## Question

# Five different laboratories participated in an interlaboratory study involving determinations of the iron level in water samples. The results below are replicate determinations of Fe

Five different laboratories participated in an interlaboratory study involving determinations of the iron level in water samples. The results below are replicate determinations of Fe in ppm for laboratories A through E

(a) State the appropriate hypotheses.

(b) Do the laboratories differ at the 95% confidence level? At the 99% confidence level (Fcrit = 5.99)? At the 99.9% confidence level (Fcrit = 11.28)?

(c) Which laboratories are different from each other at the 95% confidence level?

## Result No. Lab ALab BLab CLab DLab E 10.3 9.5 10.1 8.6 10.6 1 9.9 | 10.0| 9.3 9.6 10.4 9.2 2 11.4 10.5 9.8 11.1 3.

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