Compare two survey results (A vs B) using a two‑proportion z‑test. Get z‑score, p‑value, and a clear “significant/not significant” decision.
No signup required for this calculator.
Enter successes and sample sizes for each group. The calculator uses a two-proportion z-test with a pooled proportion under the null.
Group A
Count of “success” outcomes.
Total observations in A.
Group B
Count of “success” outcomes.
Total observations in B.
Common default: 0.05.
Choose the hypothesis direction.
The two‑proportion z‑test compares two independent proportions by computing a pooled proportion under the null hypothesis and a standard error, then converting the observed difference into a z‑score and p‑value.
Use “successes” as the count of a yes/selected outcome, and “sample size” as the total responses in that group.
You may need a bigger sample, a bigger difference, or a different question design.