Professor williams is investigating loneliness. participants in her study complete the ucla loneliness scale to measure their levels of loneliness. they also answer questions on a survey about many aspects of their personal lives. in analyzing the results of her study, professor williams finds that as the number of friends increases, the level of loneliness tends to decrease. this represents a correlation.

According to the federal regulations, which of the following studies meets the definition of research with human subjects? 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. 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. a cognitive psychologist enrolls undergraduate students for a computer-based study about the effect of mood on problem-solving behaviors. 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.