Lesson 5: Chi-square

• is a non-parametric test; not based on any assumption or distribution of any variable.

  Chi square test
• his statistical test follows a specific distribution known as

  Chi-square distribution.
• Chi-square was developed by

  Karl Pearson
• Case in which a single event can have two or more possible outcomes

  Goodness-of-fit test
• Case in which we have two independent variables to test null hypotheses concerning their independence

  Test of independence
• is a test that measures how expectations compare to actual observed data (or model results)

  chi-square statistics
• are utilized to determine if a certain null hypothesis can be rejected based on the total number of variables within the experiment.

  degrees of freedom
• a given row and column combination

  cell