The Sampling Approach

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One of the strengths of the sampling approach is that the external validity is strong for the population of interest: the sample is randomly selected from veterans with PTSD all over the United States. The external validity is not strong for individuals who do not suffer from PTSD, or for individuals who do not live in the United States, as they are not included in the study. The random assignment of the study is also a strength, as this will help reduce sampling error and increase generalizability (Rubin & Babbie, 2016). Lastly, the compensation for completing the study could also be viewed as a strength, as it is likely to increase the amount of participation; a larger sample is beneficial as it will yield more results and make the study more general to the population of interest (Rubin & Babbie, 2016).
Research Design The name of the design is: experimental treatment pretest-posttest comparison design. After the participants are randomly selected for one of the four groups (one to receive PE, one to receive CPT, one to receive both PE and CPT, and one that does not receive an intervention), they are then administered the Posttraumatic Cognitions Inventory scale (Foa et al., 1999). The Posttraumatic Cognitions Inventory scale is used to measure PTSD symptoms, including frequency of dissociative reactions, recurrent distressing dreams, negative alterations in cognitions and mood, and marked alterations in arousal and reactivity, and is a reliable and valid scale (Foa et
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