Ethan Has Developed a Scale to Measure a Person's Fear

Multiple Choice

Ethan has developed a scale to measure a person's fear of earthquakes. After the occurrence of an earthquake, he surveys 1000 individuals and finds the mean score to be 7.8 out of a possible 10 (the higher the score, the greater the fear) . Ethan concludes that fear increases after people experience an earthquake. This study is an example of a:

A) true experiment.
B) one group pretest-posttest design.
C) control group design.
D) one-shot case study.