according to the federal regulations, which of the following studies meets the definition of research with human subjects?

According to the federal regulations, a study meets the definition of research with human subjects if it is a systematic investigation designed to contribute to generalizable knowledge and involves living individuals about whom the investigator obtains data through intervention, interaction, or identifiable private information. Among typical examples, a study that meets this definition is one in which a cognitive psychologist enrolls undergraduate students for a computer-based study about the effect of mood on problem- solving behaviors. This study involves living individuals, systematic investigation, and interaction, thus fitting the federal definition of research with human subjects. Other examples like class exercises, use of aggregate data not about individuals, or analysis of publicly available non- identifiable information do not meet the definition since they lack either systematic investigation for generalizable knowledge or involvement of living individuals as defined. In summary, federal regulations define research with human subjects as systematic studies involving living individuals from whom data is obtained by intervention/interaction or identifiable private information, such as the cognitive psychology study example.