Homework Assignment #6

Hand-written work for this homework is acceptable, provided it is legible. There are a total of 15 points possible. Please show all work for these problems. The work for this should be done by hand (calculator) and not using a statistical software program (e.g., SPSS). For full credit, you must show all work and steps you used.

1. . A researcher is Recent research indicates that the effectiveness of antidepressant medication is directly related to the severity of the depression (Khan, Brodhead, Kolts, & Brown, 2005). Based on pre-treatment depression scores, patients were divided into four groups based on their level of depression. After receiving the anti-depressant medication, depression scores were measured again and the amount of improvement was recorded for each patient. The following data are similar to the results of the study:

   Low Moderate	High Moderate	Moderately Severe	Severe
   0	1	4	5
   2	3	5	6
   2	2	2	6
   0	2	4	3

   1. . Do the data indicate significant differences among the four levels of severity? Test with α = .05.
2. There is some evidence that high school students justify cheating in class on the basis of poor teacher skills or low levels of teacher caring (Murdock, Miller, and Kohlhardt, 2004). Students appear to rationalize their behavior based on perceptions of how their teachers view cheating. Poor teachers are thought not to know or care whether students cheat, so cheating in their classes is okay. Good teachers, on the other hand, do care and are alert to cheating, so students tend not to cheat in their classes. The following are hypothetical data similar to the actual research results. The scores represent judgments of the acceptability of cheating for the students in each sample.

   Poor Teacher	Average Teacher	Good Teacher
   5	9	11
   4	6	10
   3	7	8
   7	5	6
   4	3	7
   	3	10

   1. Test the hypothesis that the group means are equal across conditions using an α of .05. Is their evidence that cheating differed across conditions?
      3) The following data are constructed so that there is no variability inside any of the treatment conditions.
      a) Before you begin any calculations, predict what value should be obtained for SSwithin.
      I II III

      1	2	3
      1	2	3
      1	2	3
      1	2	3
      1	2	3

   2. What does _SSwithin equal?

1. Calculate _SStotal ^and SSbetween.

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