Given two large or two small distriutions, this will determine a (90-99)% estimation of confidence interval for the difference of means for small or large sample populations.

Also performs hypothesis testing including standard error calculation.

This calculator has 7 inputs.

Also performs hypothesis testing including standard error calculation.

This calculator has 7 inputs.

- α = 1 - Confidence%
- (x1 - x2) - zscore
_{α}x √a < μ1 - μ2 < (x1 - x2) + zscore_{α}x √a

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- alternative hypothesis
- opposite of null hypothesis. One of the proposed proposition in the hypothesis test.

H_{1} - confidence interval
- a range of values so defined that there is a specified probability that the value of a parameter lies within it.
- confidence interval/hypothesis testing for the difference of means
- hypothesis testing
- statistical test using a statement of a possible explanation for some conclusions
- mean
- A statistical measurement also known as the average
- null hypothesis
- in a statistical test, the hypothesis that there is no significant difference between specified populations, any observed difference being due to sampling or experimental error.

H_{0} - standard error
- measures how far the sample mean (average) of the data is likely to be from the true population mean

SE = σ/√n