4. The article "Gender Differences in Individuals with Comorbid Alcohol Dependence and Post-Traumatic Stress Disorder" (Amer. J. Addiction, 2003: 412-423) reported the accompanying data on the Obsessive-Compulsive Drinking Scale (OCSD) score. Gender Male Female Size 44 40 Sample Mean 19.93 16.26 SD 7.74 7.58 (a) Based on the above data, construct a 95% confidence interval for the mean OCSD score for males.

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