Final answer:
The SRRS is used in correlational research to measure the correlation between stress and health. It cannot show a causal relationship between stress and illness. Both stress and illness can influence each other in a feedback loop.
Step-by-step explanation:
The Social Readjustment Rating Scale (SRRS) is used in correlational research to identify the connection between stress and health. It measures the number of life change units (LCUs) a person experiences within a certain period of time and correlates it with self-reported symptoms indicating health problems. The SRRS cannot show a causal relationship between stress and illness because it only measures the correlation and does not account for other factors that could influence the relationship. If causation was possible, it could be argued that both stress causes illness and illness causes stress, as they can feed into each other.