Final answer:
A cohort is a group of individuals with a shared characteristic, typically defined by time like the year of birth, and observed over time to study changes and patterns. This is not merely a collection of subjects with varying demographic variables. False.
Step-by-step explanation:
False. A cohort is not simply a group with different ages, weights, genders, and health statuses. Instead, a cohort refers to a group of individuals who share a particular demographic characteristic, generally determined by time, such as the year of birth, and then observed at intervals through time.
For instance, a birth cohort may include all individuals born in a particular year. This group would then be observed over time to perceive changes and patterns in health, socio-economic status, or other life events. Cohorts can be useful in conducting longitudinal studies, where researchers can track changes and identify patterns among individuals within the cohort over time.