Photoshop, body image, and choosing the right statistical test: The lingerie company Aerie stopped modifying the photos of its models in an ad campaign that it called Aerie Real. Psychology researchers wondered whether this was just a publicity stunt or whether it could have a positive impact on the women who viewed the ads (Convertino et al., 2016). They randomly assigned 200 women to two groups. One group saw photos of Aerie models that were digitally modied, and a second group saw photos from the new Aerie Real campaign.

All participants then completed the Body Image State Scale, which includes six questions that participants rate on a scale of 1–9. Overall, the researchers did not nd a statistically signicant difference between the two groups (although they did nd a positive effect of the Aerie Real campaign among women who were more focused on physical appearances). What statistical test might they have used?

Putting it All Together