a statistical procedure that enables the investigator to determine how closely an experimentally obtained set of values fits a given theoretical expectation

Used to test for association between categorical variables. For instance are males more likely to choose to watch sport on television than females

A test of statistical significance which tests one measure of how well your model of expected distribution fits the observed distribution.

A statistical test used to determine whether an experimental result would conform to an expected result if chance alone were operating. The chi-square value is usually converted to a probability (P) value, i.e., the probability that the expected result is due to chance. When P is less than 0.05, statistical significance is claimed.