Use our free Chi Squared Goodness of Fit Test Calculator to quickly assess if your observed data distribution significantly differs from a hypothesized or expected distribution. Ideal for analyzing categorical data, our tool calculates the Chi-squared statistic, degrees of freedom, and provides a clear p-value interpretation for your statistical analysis, making hypothesis testing simple and accurate.
Formula:
The Chi-squared (χ2) statistic for the Goodness of Fit test is calculated using the formula:
χ2 = ∑ (Oi - Ei)2⁄Ei
- Oi: The Observed frequency for category i
- Ei: The Expected frequency for category i
- ∑: Represents the summation across all categories