Another calculator for a two-sample proportion z-test: Two Sample Proportion z-Test Calculator This web calculator conducts a z-test for the difference between two populations' proportions. The ...

z-test for population proportion: z-Test for Population Proportion This applet allows users to specify a hypothesized population proportion, sample proportion and sample size as well as an alternative ...

By plugging the values into the Binomial formula we get 0.196, the probability of 6 or fewer HSV cases out of 20 (one tailed test). Since our hypothesis of interest is whether the observed and ...