A researcher wants to study the subjective experience of personal growth following a significant life challenge. The goal is to understand the whole, unique experience of each individual. Which of the following research methods would be least consistent with this goal?

A psychologist believes that to understand personal fulfillment, one must examine an individual's complete and unique life experience, rather than breaking it down into isolated, measurable components. Given this perspective, which of the following research questions would be the least compatible with the psychologist's approach?