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A new treatment for insomnia is being studied. In an experiment, there were 249 patients receiving...

A new treatment for insomnia is being studied. In an experiment, there were 249 patients receiving the new treatment and 173 patients in the control group, receiving an existing treatment. Of the patients in the treatment group, 192 showed improvement. Of those in the control group, 116 showed improvement. Is there evidence that the new treatment is more effective?

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