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About
The Chi-Square Test Calculator is an online tool for performing chi-square goodness-of-fit and test-of-independence calculations. It is designed for students working with categorical data in biology, genetics, statistics, and related coursework. The goodness-of-fit calculator compares observed counts with hypothesized or expected frequencies and can be used to check Mendelian genetic ratios, uniform distributions, and similar assignments. The test-of-independence calculator uses a contingency table to evaluate whether two categorical variables are independent, with expected frequencies calculated automatically. The tool reports the chi-square statistic, degrees of freedom, p-value, critical value, and statistical decision. It also provides a cell-by-cell calculation breakdown showing observed values, expected values, deviations, squared deviations, and their contributions to the chi-square statistic. Example datasets include a monohybrid cross, fair coin toss, clinical treatment, and product preference. The calculator operates client-side and is presented as a resource for verifying statistics homework calculations.
Problem & solution
Problem
Manual chi-square calculations are time-consuming and prone to math errors.
Solution
Calculates chi-square statistics, p-values, critical values, and intermediate steps.
Who it's for
Students studying biology, genetics, statistics, and categorical data.
Main features
- Goodness-of-fit test
- Independence test
- Step-by-step calculations
- P-values and critical values
- Contingency tables
Use cases
- Check Mendelian genetic ratios
- Test categorical variable independence
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