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How to find confidence interval

Our confidence interval calculator differs from others
in that the result depends on the amount of data entered.
The average general formula is only used for
a very large number of data tests.

* Result depends on the number sample
95 confidence interval default probability %

Select percentage:

How Many in Sample:

Sample Mean:

Sample standard Deviation:

Number of samples:
Standard Deviation:

95 % confidence interval

± 0

Interval 0 to 0

Another form of data entry

Fisher, R.A. (1956) Statistical Methods and Scientific Inference. Oliver and Boyd, Edinburgh.

Freund, J.E. (1962) Mathematical Statistics Prentice Hall, Englewood Cliffs, NJ.

Venttsel, E.S.(1964) Probability theory, Moscow.

Keeping, E.S. (1962) Introduction to Statistical Inference. D. Van Nostrand, Princeton, NJ.

Gumbel, E.J. (1958) Statistics of extremes.

other references