If a researcher selects a sample of 1000 managers and polls them about their workload, the managers with high workload, the managers with a high workload may not answer the survey because they didn't have enough time to answer it. This is one example of:

a) low internal validity
b)nonresponse bias
c)sampling error
d)novelty effects

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.