Assume that youare a reader on a Master student’s thesis committee. The student has carriedout a study of the effects of mood on recall for different kinds of material.Each subject from a total sample of 80 was randomly assigned to either adepressed mood-induction condition or a neutral-mood condition. Following themood induction, each subject was given a list of verbal tasks to solve. Thetask difficulty is randomly selected from easy or difficult. The hypothesismotivating the study was that the decrement in performance exhibited by thedepressed subjects would be greater on the difficult items than on the easyitems. The following source table was included in the thesis:

a.       1. Is there anything wrong with this analysis?

b.    2. If the analysis were to be done correctly, whatsources, error terms, and degrees of freedom would be used?

c.     3.  Can you determine the sum of squares for any of theeffects in the correct analysis?

d.     4. What is your conclusion?

中文版本：

假设你是一个硕士学生论文委员会的成员。该学生进行了一项研究情绪对任务完成情况的影响。

这是一个2（充满压力VS无压力）*2（困难的任务VS 简单的任务） 的实验设计。从总的80个样本中选取的任何一个受试者被随机分配到两种情绪情形（有压力的情况 VS 无压力的情况）。在情绪感应之后，每个受试者被要求进行解决问题的测试，任务的困难是随机分配的（简单VS复杂）。

论文的基本假设是：充满压力的情况下，受试者完成任务的表现会下降。而且在复杂的任务条件下下降的程度大于简单的任务条件下。

a.      a. 这个分析有什么问题？

b.     b. 如果正确分析的话，应该使用什么样的sources, error terms,和自由度？

c.      c. 如果正确分析的话，平方和(sum of square)是多少？

d.     d. 你的结论是什么？