They want to see if more studying leads to passing. But they face a statistical crossroads between two similar-sounding tools. The Point-Biserial Path
They calculate a Point-Biserial Correlation . This tells them the strength of the relationship between hours studied and the actual binary outcome of passing or failing. biserial correlation
Use this when the binary variable is "true"—like being a "smoker" vs. "non-smoker". The Biserial Path They want to see if more studying leads to passing
Imagine a high school where everyone is obsessed with a difficult math competition. Two friends, and Dichotomous Dan , decide to investigate what makes a student successful. This tells them the strength of the relationship
Clara loves precision. She tracks the students spend studying (a continuous variable). Dan, however, is only interested in the final result: did they Pass or Fail (a dichotomous variable)?