## Descriptive statistics

Descriptive statistics is the branch of statistics that involves organizing, displaying, and describing data.

## Chi-squared test

The chi-squared test, also written as $$\chi^2$$ test, is used to determine whether there is a significant difference between the expected frequencies and the observed frequencies in one or more categories.Without other qualification, ‘chi-squared test’ often is used as short for Pearson’s chi-squared test. Chi squared test can be used for different purposes, for example: testing … Leggi tuttoChi-squared test