Use of q-test and confidence limits in analytical chemistry?

what will the confidence interval tell you?

Answer:
The q test is a procedure for the detection of outliers.

A confidence interval is an interval that encloses the true parameter (e.g. the true mean) with high probability. That is, in a meta-experiment of repeatedly sampling from the same population and constructing a (say) 95% confidence interval for the mean, 95% of such intervals will contain the mean. You can't know for sure if the actualy confidence interval you calculated contains the true mean, but you do know that the procedure you used to construct the confidence interval will generate an interval that contains the true mean 95% of the time.

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