Four analysts perform replicate sets of Hg determinations on the same analytical sample. The results in ppb Hg are shown in the following table:
Determination | Analyst 1 | Analyst 2 | Analyst 3 | Analyst 4 |
1 | 10.24 | 10.14 | 10.19 | 10.19 |
2 | 10.26 | 10.12 | 10.11 | 10.15 |
3 | 10.29 | 10.04 | 10.15 | 10.16 |
4 | 10.23 | 10.07 | 10.12 | 10.10 |
(a) State the appropriate hypotheses.
(b) Do the analysts differ at the 95% confidence level? At the 99% confidence level (Fcrit = 5.95)? At the 99.9% confidence level (Fcrit = 10.80)?
(c) Which analysts differ from each other at the 95% confidence level?
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