During the posttest of an experiment, the fire alarm sounded in every building on campus, producing which of these problems for experimentation?
a. history c. testing
b. maturation d. intrusion
Question 2
If I wanted to measure the number of nightmares in children before and after they learned a meditation technique, and the events of September 11, 2001 happened during the meditation training, it would be an example of which of these problems for experimentation?
a. history c. maturation
b. disruption d. testing