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: = n
Chance of success: = p
How many successes: = S
HYPERGEOMETRIC
Population size: = N
Group 1 size: = N1
Sample size: = n
Group 1 successes: = S
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: 		=S
α:

Lower bound of 100(1-α)%
Hypergeometric Confidence Interval
Population size: = N
Sample size: = n
Observed number
selected from Group 1:		 = S
α: