Joni teaches a preschool class. She has eight students and ranks them based upon math and reading ability. She would like to see if there is a relationship between how well her students are ranked in math and in reading. Which of the following correlations should she use?
A) Kendall's tau
B) Phi coefficient
C) Biserial
D) eta

Question

Quizplus · Accepted Answer

Kendall's tau is a non-parametric measure of association that is appropriate for finding a relationship between two ranked variables. As the teacher has ranked her students based upon their math and reading abilities, Kendall's tau would be a suitable correlation coefficient to use in this scenario. Phi coefficient and eta are measures of association for nominal variables, and the biserial correlation is used to measure the relationship between a nominal and continuous variable.

Joni Teaches a Preschool Class