The chi-squared test, often written as χ2 test, is a statistical hypothesis test used in the analysis of categorical variables to determine whether observed data are different from expectations. In ...

On watching this video, students should be able to: Recall that a chi-squared test of independence can be used for two categorical variables and write down the null hypothesis for this test Explain ...

A rigorous method of utilizing information from a previous study when determining the sample size for a chi-squared test is outlined. The approach is able to guarantee that the average power of all ...