The Assumption of Proportional Hazards When Using the Kaplan-Meier Method

question 7

Multiple Choice

The assumption of proportional hazards when using the Kaplan-Meier method states which of the following?

• A) The hazard ratio between the two groups must be normally distributed.
• B) The hazard ratio between the two groups stays constant over time.
• C) The hazard ratio is in direct proportion to the sample sizes in each group.
• D) The hazard ratio is the same as the overall number of deaths in each group.

---

Definitions:

Yerkes-Dodson Law

A psychological principle that asserts there is an optimal level of arousal for the best performance of a task: too little arousal can lead to underperformance, while too much can lead to mistakes.

Simple Tasks

Activities or tasks that require a minimal amount of cognitive or physical effort to complete.

Industrial/Organizational Psychologists

Professionals who apply psychological principles and research methods to improve the workplace environment, productivity, and employee-related issues.

Psychotherapy

A therapeutic treatment involving psychological techniques to improve mental health and well-being.