The researcher is studying an intervention designed to reduce job stress in emergency department nurses. Just before the study data collection was to start, an emergency department nurse was killed in the line of duty by a mentally deranged patient. What potential threat to the internal validity of the study does this occurrence pose?
1. Selection bias
2. History
3. Testing
4. Maturation
Question 2
Which threat to external validity is controlled for in a double-blind experimental study?
1. Rosenthal effect
2. Hawthorne effect
3. Experimenter effect
4. Measurement effect
Negative Effects of Chronic Stress
Typical laboratory emergency shower.
Vulnerability – Stress Model
The Stress Response
studying