Question

the big five was created using what method?
observational research
self - report
factor analysis
case studies

Explanation:

The Big Five personality traits (Openness, Conscientiousness, Extraversion, Agreeableness, Neuroticism) were developed using factor analysis. This statistical method identifies underlying factors (traits) from a large set of variables (personality - related terms or items). Observational research focuses on observing behavior, self - report is about individuals reporting on themselves (used in measuring Big Five but not creating the model), and case studies involve in - depth study of individual cases, none of which were the method for creating the Big Five model.

Answer:

C. factor analysis