3. Compare the equality of variances
Several tests exist for comparing variances. For the purposes of this example, we have chosen the Cochran test because it deals with the highest variance. Indeed, it would be unfair to discard an instrument on the grounds of "too good a repeatability". We will therefore test the highest variance against all the others:
If the C ratio is less than the Cochran critical value at 5% C CRIT...
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Compare the equality of variances
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