Cyclozocine was an alternative to methadone for treating heroin addiction. The following data came from 14 males who were chronic heroin addicts. After cyclozocine had removed the addicts' physical dependence on heroin, they were asked a batter of questions to assess their psychological dependence. The test scores are called Q-Scores and high values represent less psychological dependence. The Q-Scores were as follows: 51, 53,43, 36, 55, 55, 39, 43, 45, 27, 21.26, 22,43 Prom past experience, the mean score for addicts who have not had a cyclozocine treatment is about 28. Is cyclozocine an effective treatment for psychological dependence?

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