Case Study

Dr. Zak developed a test to measure depression. He sampled 100 university students to take his five item test. The group of students was comprised of 30 men and 70 women. In this group, four persons were African American, six persons were Hispanic, and one person was Asian. Zakâ??s Miraculous Test of Depression is printed below:

1. I feel depressed: Yes No
2. I have been sad for the last two weeks: Yes No
3. I have seen changes in my eating and sleeping: Yes No
4. I donâ??t feel that life is going to get better: Yes No
5. I feel happy most of the day: Yes No

Yes = 1; No = 0

The mean on this test is 3.5 with a standard deviation of .5.
Question:
What other items do you think need to be included in Dr. Zak’s domain sampling?
(Check construct validity of Beck’s depressive index for assistance)
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Solution Preview

Here is what I recommend that Dr. Zak do for his case study. He needs to have two groups to study by using a double-blind format. This will help him immensely because it will then make sure that he is able to get a better analysis on those that are depressed versus those that are not. He will need to use ANOVA to compare the two groups. He may want to consider having at least two-hundred …