Following the september 11, 2001 twin towers attacks in new york city, many americans opted to drive rather than fly when traveling. the media coverage of the hijackings caused americans to overestimate the danger of flying. as it was an event they remember easily, they assumed it could occur frequently. this example illustrates:

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.