Choose a distribution

Binomial - used to model situations with independent trials having 2 possible outcomes, and the same probability on each trial.

Hypergeometric - used when sampling from a dichotomous population without replacement.

Standard Normal - shows tail probability for specified Z-value.

Compute Probabilities

BINOMIAL

Number of trials:

Chance of success:

How many successes:

HYPERGEOMETRIC

Population size:

Group 1 size:

Sample size:

Group 1 successes:

NORMAL

Z-value:

Chi-Square 2x2 contingency test
Group1Group2Totals
Success
Failure
Totals

Exact 1-Tailed Confidence Intervals

Lower bound of 100(1-α)%
Binomial Confidence Interval

Number trials: =n

Observed
Nbr Successes: =k

α:

Lower bound of 100(1-α)%
Hypergeometric Confidence Interval

Population size:

Sample size:

Observed number
selected from Group 1:

α: