volunteer sampling - a media campaign offering freeintervention aimed at treating aerophobia - 41 pps randomly assigned to either the treatment group or control group
AO3
unethical as the control group believed they were receiving free therapy but were deceived
AO1
PPs fear of flying was tested using EPAV scales which measured the occurrence of catastrophic thoughts eg engine falling off
AO3
scientific as its an objective measure so produces quantitative data
AO1
concluded that systematic desensitisation is an effective treatment for aerophobia
AO3
can be applied in the real world as there are social and economic benefits ex people can fly to meet family
AO1
strict control over extraneous variables ex the room being 22.5degrees