P-Value Calculator for Chi-Square

Calculate the degrees of freedom for the contingency table using the following formula; df= (rows – 1) x (columns – 1).

Further Information

• Chi-Square (Χ²) Test
• p-value and significance

What is the chi-square test used for?

The chi-square test is used to determine if there's a significant association between categorical variables. It compares observed frequencies (what you actually count) to expected frequencies (null hypothesis prediction), helping researchers assess whether differences are due to chance or a real relationship in the population.

When to use chi-square test vs t test?

Use a chi-square test for categorical data to assess relationships between variables. Use a t-test for comparing means of continuous data, typically between two groups. Chi-square examines frequency distributions, while t-tests analyze differences in averages of numerical data.