A psychologist used a set of negative images to assess angry attitudes before and after participants took part in a 30-minute anger management session.
In a repeated measures design, 15 participants were tested before and after the session using a single set of images.
Explain how two sets of images could be used in this study and why this would be an improvement
Each participant had a different total score in the before condition, where the maximum score was 40 and the median score was 23.
How many of the participants had a score < the median in the before condition? Explain your answer.
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