Problem: Eric studies stress among family members who care for individuals with dementia. He has recently undertaken a study examining the impact of unemployment on caregivers. He recognizes that their stress levels are likely to increase and worries that many of the participants in his research already had such high levels of stress that he will simply be unable to detect increases associated with unemployment. What is Eric concerned about? Bias Ceiling effects Artifacts Floor effects A ____ research study occurs when neither the researcher nor the participants know the predicted outcome. Double-blind Naturalistic Biased Controlled Lauren is not happy about the requirement that introductory psychology students participate in research, so when she does participate, she tries to figure out what the researcher hopes to demonstrate and sets out to do the exact opposite. What "role" is Lauren playing? Negativistic subject Good subject Faithful subject Apprehensive subject. Need Assignment Help?