SurveyStat provides standard statistical testing for survey data, including T-Tests for means and Z-Tests for proportions.
Significance Testing
We use two-tailed tests at the 95% confidence level (p < 0.05) by default.
1. Z-Test for Proportions
Used when comparing percentages (e.g., Top 2 Box scores) between two independent groups.
Z = (p1 - p2) / √[ p(1-p)(1/n1 + 1/n2) ]
Where p is the pooled proportion.
2. T-Test for Means
Used when comparing average scores (e.g., 5-point scale means) between two independent groups. We assume unequal variances (Welch's t-test).