Hypothesis Testing
Chi-Square Checker
Analyze frequency tables, compute chi-square statistics, and make hypothesis decisions on categorical data.
How It Works
- 10 rounds of chi-square testing scenarios at α = 0.05
- Calculation rounds: Compute the χ² statistic from a frequency table and pick the closest value from 4 choices
- Decision rounds: Given χ² and the critical value, decide to Reject or Fail to Reject H₀
- Rounds alternate between calculation and decision types
- Includes both Goodness-of-Fit and Independence test scenarios
- Correct answer = +10 pts · Wrong = 0 pts
- Grades: A (90+), B (80+), C (70+), D (60+), F (<60) out of 100
Chi-Square Test Statistic
χ² = Σ (O − E)² / E