A therapist provides treatment to 50 percent of people with depression seeking help,while putting the others on a waiting list.After three months,he evaluates most of his patients as less depressed than those on the waiting list.What is wrong with this study?

Question

A therapist provides treatment to 50 percent of people with depression seeking help,while putting the others on a waiting list.After three months,he evaluates most of his patients as less depressed than those on the waiting list.What is wrong with this study?​

Quizplus · Accepted Answer

The study lacks the use of a blind observer, which could have ensured that the therapist's biases did not affect the evaluation of patient progress. Without a blind observer, it is possible that the therapist's own beliefs about the effectiveness of their treatment could have influenced their evaluation of patient progress. This makes it difficult to draw accurate conclusions about the effectiveness of the treatment.

A Therapist Provides Treatment to 50 Percent of People with Depression