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A researcher tests whether a new study technique improves focus. The treatment group is told: 'This technique is backed by 15 years of neuroscience research and showed 40% improvement in our pilot study.' The control group is given a placebo technique with no such description. Both groups complete a focus task and are explicitly told the study is investigating technique effectiveness. The treatment group shows significantly better focus performance. Which threat to validity is most relevant?
A researcher tests whether a new study technique improves focus. The treatment group is told: 'This technique is backed by 15 years of neuroscience research and showed 40% improvement in our pilot study.' The control group is given a placebo technique with no such description. Both groups complete a focus task and are explicitly told the study is investigating technique effectiveness. The treatment group shows significantly better focus performance. Which threat to validity is most relevant?