CONFIDENCE INTERVAL CALCULATION:

Calculation of the confidence interval (CI) of a parameter's mean value X with a known standard deviation and sample size, at a given confidence level.
This applies to a parameter with repeat measurements.
Example: calculation of the 90 percent confidence interval of the average gold recovery from 4 repeat flotation tests.

To use:

Enter the mean (μ) obtained from the repeat measurements/tests.

Provide the standard deviation (σ).

Enter the sample size n

Enter the alpha value between 0 and 1 (e.g. 0.1 for 90% confidence level or 0.05 for 95% confidence level) for which the corresponding confidence interval is to be calculated.

Click on "Calculate" to calculate the confidence interval, and the results will be shown below.

Watch a Youtube video example.

Mean (μ):
Standard Deviation (σ):
Sample size n:
Alpha:

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