Question 1

What is a chi-square test?

Accepted Answer

A chi-square test is a statistical method used to determine if there is a significant association between categorical variables (test of independence) or if observed data fits an expected distribution (goodness-of-fit).

Question 2

How do I enter data for a chi-square test?

Accepted Answer

Enter your observed frequencies and expected frequencies as comma or space separated numbers. Each list must have the same number of values. The calculator computes the chi-square statistic and p-value automatically.

Question 3

What are degrees of freedom in chi-square?

Accepted Answer

For a goodness-of-fit test, df = number of categories - 1. For a test of independence with an r×c contingency table, df = (rows-1) × (columns-1).

Question 4

Is this chi-square calculator free?

Accepted Answer

Yes, this tool is completely free and runs entirely in your browser. No data is uploaded to any server.