In one national survey, nine out of ten people who have sought mental health care said their lives improved as a result of the treatment. Describe three different factors that could bias these results; and explain how a therapy's value could be determined scientifically.

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The Answer of In one national survey, nine out of ten people who have sought mental health care said their lives improved as a result of the treatment. Describe three different factors that could bias these results; and explain how a therapy's value could be determined scientifically.

In One National Survey, Nine Out of Ten People Who