What term describes all the cases in a studied group from which samples may be drawn?

The term that describes all the cases in a studied group from which samples may be drawn is "population." In research, a population encompasses the entire group of individuals or instances that share common characteristics and from which researchers can select a smaller group, or sample, for analysis. When conducting studies, understanding the full population is critical as it helps define the context in which the research is being conducted and ensures that the samples drawn can provide meaningful insights or extrapolations to the broader group.

The other terms mentioned refer to different concepts within research. A subset typically denotes a smaller group selected from a larger population but does not encompass the entire group itself. A community usually refers to a group of individuals living in the same area or sharing common interests rather than a statistical term. Sample size refers to the number of individuals or instances included in a sample drawn from the population and does not define the population itself.