This page calculates either sample size or power for one a one sample binomial problem. Users choose between a one-sided and two-sided test and specify the null and alternative hypothesized...
This page calculates either estimates of sample size or power for differences in proportions. The program allows for unequal sample size allocation between the two groups.
In this activity, students explore calculations with simple rates and proportions, and basic time series data, in the context of news coverage of an important statistical study. From 1973 to 1995, a...
This calculator computes the probability that two proportions are equal, given sample proportions. The user inputs values for x1, n1, x2, and n2. The null hypothesis is that the two proportions are...
This page calculates either estimates of sample size or power for equivalence studies. Exponential distributions are assumed and are specified using the ratio of hazard for treatment 1 to hazard for...
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