Chi-square formula is a statistical formula to compare two or more statistical data sets. It is used for data that consist of variables distributed across various categories and is denoted by χ 2.

Dec 15, 2025 · Learn about the Chi-Square test, its formula, and types. Understand when to use the tests, chi-square distributions, and how to solve Chi-Square problems.

Chi-squared distribution, showing χ2 on the first axis and p -value (right tail probability) on the second axis. A chi-squared test (also chi-square or χ2 test) is a statistical hypothesis test used in the …

Simple explanation of chi-square statistic plus how to calculate the chi-square statistic. Free online calculators and homework help.

So how do we calculate this p-value? We use the Chi-Square Test! Note: Chi Sounds like "Hi" but with a K, so it sounds like " Ki square" And Chi is the greek letter Χ, so we can also write it Χ2. Important …

May 23, 2022 · Calculate the chi-square value from your observed and expected frequencies using the chi-square formula. Find the critical chi-square value in a chi-square critical value table or using …

Nov 27, 2025 · The formula for the chi-squared test is χ 2 = Σ (Oi − Ei)2/ Ei, where χ 2 represents the chi-squared value, Oi represents the observed value, Ei represents the expected value (that is, the …

Throughout this guide, we've progressed from fundamental concepts to sophisticated applications, exploring the mathematical derivation of the chi-square formula, working through detailed examples, …

Aug 29, 2023 · The chi-square statistic tells you how much difference exists between the observed count in each table cell to the counts you would expect if there were no relationship at all in the population.

Oct 2, 2025 · Chi-square is a statistical measurement that shows how well a model fits the observed data. What Is a Chi-Square (χ2) Statistic? A chi-square (χ2) statistic is a test that compares...