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【简答题】
一临床医生发现抑郁症患者在奖赏面前无法像正常人那样感到快乐，于是他猜测抑郁症患者可能存在快感体验缺失。基于这个猜测，他做了一项实验。他让抑郁症患者和普通人各30名，完成一项容易获得奖赏的任务。然后，让他们对自己在获得奖赏时的快乐体验(如：我感到高兴的程度)进行评分。这样，该医生共获得30名患者和30名正常被试的快乐评分。对获得的数据进行分析，并得到如下表的结果： 请问： (1)该研究结果使用了什么统计方法? (2)该医生的零假设和备择假设分别是什么?本结果是否支持最初的猜测?
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