According to the federal regulations, which of the following studies meets the definition of research with human subjects? a. a researcher conducts a comparison of the comments made in a publicly available blog and the blogger's comments on a similar topic in a weekly magazine. b. a researcher sets up a meeting with the superintendent of a large and diverse public school system to get data about the ethnic composition of the school system and the number of students receiving free lunches. c. a cognitive psychologist enrolls undergraduate students for a computer-based study about the effect of mood on problem solving behaviors. d. undergraduate students in a field methods class are assigned a research question and asked to interview another classmate, to be followed by a class discussion on interview techniques.

the answer is: A cognitive psychologist enrolls undergraduate students for a computer-based study about the effect of mood on problem-solving behaviors.

Here the requirement for research with human subjects according to the Fed :

"Obtains information or biospecimens through intervention or interaction with the individual, and uses, studies, or analyzes the information or biospecimens; or Obtains, uses, studies, analyzes, or generates identifiable private information or identifiable biospecimens."

The experiment on this ption fulfill the criteria because:

- The experiment should use studies or analytics to obtain some sort of private information from the subjects.  (such as their mood)

- The experiment should make some sort of intervention that can be used to measure its hypothesis. (in the case above, the researchers could put the subject under a certain level of stress before telling them to  solve a set of problems)

- The researchers need to interact with the subject in a certain way. (since the researchers meet the undergraduate directly, it's considered as an interraction)

a. the moon was locked into orbit by the earths gravity as it was passing by and capture hypothesis i think

what he said above me         look up that's the answer