What is the Chi-Square Calculator?

The Chi-Square Calculator is a statistical tool that helps students, researchers, and analysts determine how well observed data fit expected distributions. By entering the observed and expected values, the calculator computes the chi-square (χ²) statistic, which can be used for goodness-of-fit tests or tests of independence. This allows quick and accurate assessment of whether differences between observed and expected frequencies are statistically significant.

How to Use:

1. Enter Observed Values (O): Input the observed frequencies or counts, separated by commas (e.g., 10, 20, 30).
2. Enter Expected Values (E): Input the expected frequencies or counts, separated by commas. The number of expected values must match the number of observed values.
3. Click “Calculate”: The tool computes the chi-square statistic using the formula χ2=∑(Oi−Ei)2Ei\chi^2 = \sum \frac{(O_i – E_i)^2}{E_i}χ2=∑Ei​(Oi​−Ei​)2​.
4. Review Result: The output displays the observed values, expected values, and the calculated chi-square statistic, clearly formatted for easy interpretation.